Gonna be tough to make 450 hp n/a without more compression ratio. I have an about 450 hp 340+.030, but I wouldn't call it streetable. Never dynoed, but the various calculators put it at somewhere between 430-465 hp. 12.2:1 forged pistons, .585/275°@.050 solid cam, 1.5 rockers, decently ported...