Having issues with the new 464, so it's coming out. Going back with the tried and true 430 that went 11.70's 11.80s. in my 3500 pound 55' studebaker. 430 had the 430 heads w/stage 1 valves and some home porting. Going to bolt on the ported stage 2 se's that flow 340 from the 464. The old 430 is stock bottom end with forged replacement pistons and a hemi killer cam and sp-1 intake. What's y'alls guess on what it would pick up with the better flowing heads?