My cousin runs STOCK performer rpms aluminums on his 350 with a 6-71 (10-12lbs of boost).
It runs 9.80s with 0 problems..
In 3 years of racing on this motor he's had to change the head gasket once..
You'll probably save at least 80lbs off the front of your motor with those aluminum heads. Plus with a blower you will be able to run more timing without detonation.
I would think with a blower you would definitely want alumnimum!
Shane Buss 92 Firebird 355, Holley 750 Carb, Vortec 1.94/1.50 Heads (Ported,Polished,Milled .025), 10:1 Comp Ratio, Cam Specs 224/234 498/520, 1.6 Roller Rockers, Hooker Headers, Flowmaster, !Cat, 3.73 Posi, Msd 6A Ignition Cyb. Speedo box http://users.ev1.net/~sdbuss/index.html
Note all girls on web page are x's, and will be removed when i get more time
OH i forgot. WEIAND SUPERCHARGER