My buddy is stock cammed w/ GT-40 intake and unported(per say) Iron GT-40 heads. He has gone 12.40
I am doing the edelbrocks right now(should be done in two weeks)
They are ported pretty good...not too opened up but cleaned really well.
W/ the extrude honed cobra intake...i am expecting to go about 12.00-12.20
That is b-cam w/ 1.7's
If you go w/ the TFS..make sure you get 2nd gen heads...my other buddy sent 3 sets back from valve guide problems. They only lasted about 5000 miles each.
Performance wise....i think they are about close. I wouldn't go performer rpm...they are 2.02 valves......so are the twisted wedge..but i know people w/ the tfs heads and no fly-cut pistons...don't know anyone w/ rpm's...so don't know if they work...edelbrock say's "no" w/ stockers.
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4.10's,long tubes & 75 shot...Goes 12.50's
Check it out at
http://www.burnouts.webprovider.com
11's coming soon!!!!
Heads,intake and cam are all here