the 351 is a torquey motor, i have one in a bronco (well my dad does) its fast, 0 to 60 in like 7 sec. runs the 1/4 mile in high 15, its stock, i can only imagine that in a mustang, but if you want a hot rod type car id go with the 302, i have a 302 in my bronco, its stock and its pretty slow, but im talkin about it 5000+ pound vehical, i think the 302 has more potential