A picture of my home ported heads ... they are cut for FelPro 1007 gaskets. ADC Racing did a kick butt job on the valve job and cutting in the new valves! They do a constant radius valve job using some really sophisticated cutters.
Here's the exhaust side. We learned a lot on the flow bench ...
Here's my head jigged up on the SuperFlow flow bench. We played around to get good baseline numbers (which were taken at 25"). The intakes flowed pretty good at low lift, but definitely hit a plateau at higher lifts (about .480 or so).

Charlie Sikes of ADC Racing here in Fort Collins (and a GN owner too!) is twisting the dials and doing the work (while I watch! <*grin*>) I'm really impressed with Charlie's knowledge, the operation of his shop and their attention to detail.

They have a web site at:

http://www.adc-racing.com/

After doing some preliminary numbers, Charlie used a flow probe and I learned some interesting stuff ... mainly that the air on the intake side is almost ALL at the top and inside corners of the port. The floor was almost DEAD!

The exhaust side was similar ... most of the flow was at the top and sides of the port.
This is Charlie Sikes (owner) ... he's not happy with the numbers, so he took the intake valve over to the valve facer and made a 30 degree backcut. After rerunning the numbers, we picked up a consistent 10% more flow across the board and actually a bit more in the middle lifts.

It was amazing how the back cut affected low lift and mid lift flow. We picked up almost 12 cfm in the mid lift areas! It even slightly helped high lift flow (a couple of cfm).
We also flowed a set of the "Stage Jr" heads that were available a few years ago ... they were better than a bone stock set of heads, but didn't really measure up to ported ones. Here's the numbers we got out of my heads vs. Stage Jrs. One set of numbers was with the heads and unmodified intake valves. Then we back cut the intake face 30 degrees and got the second set of numbers:
Flowed @ 25"
Flow bench correction 0.295 0.295 0.295 0.295 0.295 0.295 0.295 0.295 0.295 0.295 0.295
INTAKE
LIFT 0.050 0.100 0.150 0.200 0.250 0.300 0.350 0.400 0.450 0.500 0.550
Stage Jr 29.5 44.3 70.8 97.4 119.5 129.8 137.2 138.7 141.6 144.6 143.1
Ported 26.6 47.2 76.7 106.2 132.8 153.4 162.3 171.1 175.5 174.1 175.5
Ported/backcut 29.5 56.1 85.6 116.5 144.6 162.3 169.6 174.1 175.5 175.5 177.0
Ported/backcut vs Ported (%) 11.1% 18.8% 11.5% 9.7% 8.9% 5.8% 4.5% 1.7% 0.0% 0.8% 0.8%
Ported vs Stage Jr (%) -10.0% 6.7% 8.3% 9.1% 11.1% 18.2% 18.3% 23.4% 24.0% 20.4% 22.7%
Ported/backcut vs Jr(%) 0.0% 26.7% 20.8% 19.7% 21.0% 25.0% 23.7% 25.5% 24.0% 21.4% 23.7%
Flowed @ 25"
Flow bench correction 0.315 0.315 0.315 0.315 0.315 0.315 0.315 0.315 0.315 0.315 0.315
EXHAUST
LIFT 0.050 0.100 0.150 0.200 0.250 0.300 0.350 0.400 0.450 0.500 0.550
Stage Jr 25.2 44.1 63.0 78.8 92.9 100.8 104.0 105.5 107.1 108.7 0.0
Ported 28.4 47.3 72.5 88.2 110.3 127.8 141.8 149.6 154.4 157.5 159.1
Ported vs. Stage Jr (%) 12.5% 7.1% 15.0% 12.0% 18.6% 26.6% 36.4% 41.8% 44.9% 44.9% N/A

After seeing the "puny" numbers off the stock heads, Charlie put these Stage II aluminum heads on my poor stock block to tease me! <*grin*>

Man, they look good and they are for sale ... virgin heads! Just give Charlie a call and he'd give you a smokin' deal on them (if he doesn't put them on his motor!) He's got two complete sets and carb style Stage II manifolds to match. But my better judgement is telling me to just stick with the iron stockers.

The old stockers have gone 11.20s@ 121.4+ and I hope with the new valves and such that we might be able to get a 10 out of the car. That'd be pretty cool at this altitude, but it's also a tall order for a stock block (with steel caps and a TTA crank).

We're using the Duttwieller grind 208/208, Maley valves (my stockers were pretty sad), stock lifters, my old T&D 1.65 roller rockers, original ported heads, and reusing my BRC forged pistons with new rings. I think I'm going to have to get some more injector too.
Look at those ports! Whoa! Kind of dwarf the whole rest of the motor!
Here's the deck surface of the heads. They've never been run, and only have a rough machining cut on them. They are basically virgin!