the 400 i have now makes around 375 horspower. 9.0:1 i believe, forged pistons, cast iron heads with steam holes and comp cams hydraulic flat tappet cam with what i think is a .480-.500 lift. lopey as hell and the car wont stop even with a vacuum canister, but im not sure. comp cams roller tip rockers, roller lifters, an edelbrock torker two intake and an msd pro billet and a 6al 2 box. im wondering what power increases i will see with a set of afr street eliminator series heads. 195cc chambered 2.02 heads and keeping my valve train the same for now. i also heard puting a thinner gasket will bump compression up as well. im going to go with cometic gaskets but i havent figured out the thickness yet. if anybody has a ballpark figure of what this set up will make i would appreciate it. thanks.