you build sbc because its cheap hp. thats the only real reason. ive been at this for 40 yrs.and ive never seen a stock sbc or bbc that couls hang with a same yr 440.or even fords old 406/ 4 speed combo.i have a 383 chev in a 53 ranchwagon. its fast but it could hang with my wifes chrysler 300 hemi.