erik sounds like you have bad ass 57 i love them things.there are hundreds of heads that out flow the best flowing camel backs.i had a guy come to shop last yr with a pair with about 2000 in work and they only flowed 262 max .600 lift.a set of out of box large port vortec heads flow 269 at .600.i have a set of afr 180 runner ported bye one of best guys around for sale with a super victor intake.the heads flow great down low and peak at 305 at .690 lift port speed very good. i'm selling them because they never came back to pay for them.