If you are thinking about using stock heads, do yourself a favor and check out Thumper of Orange Park
Mike Schultz, at Thumper Performance, is a wizard for making cheap power. His ported heads on basic bolt-on cars run mid to low 12's. With a small shot of nitrous
some have gone as fast as the upper 10's. That's customer reports, not Mike talking.
I certainly don't want to get into a debate on which is better, ported stock or aftermarket aluminum, chocolate or vanilla. The answer is always, "That depends". But, fast is always fast.
His packages go from $595 to $995. Here's one:
Thumper Heads and Cam combo #1 :
Thumper Ported E7s (219/155 cfm)
Vassco springs, moley retainers and keepers
For cams to .600 lift
Double roller timing chain and gear set w/9 position key way
FMS "E" ( for AOD cars), "B" , or TFS1 cam
Instructions on installation and Cam phasing for the best power and performance for you application
Proven 12 sec combination
$995.00 + 100.00 refundable core charge**
Quick is quick, regardless of the equipment. Check out his site. There's a ton of tech reports and testimonials on it.
He's doing a 347 for me.
Good luck in what y'all do.