And, Thad, beware...a history lesson to follow.... Engine performance numbers are just guidelines, and advertisement. Up to 1973, all engines were rated with little to no exhaust, and NO accessories. Beginning in '73, car companies began rating their engines with a full exhaust installed and the basic accessories (water pump, alternator, and where required, an air pump), so those numbers went down. Also, in certain instances, a 4-barrel factory engine was built differently than a 2-barrel factory engine. Case in point, the Clevelands. The 351C-2V had standard cylinder heads with narrow intake runners, a run-of-the-mill camshaft, and a 'matching' dual-plane intake. Good HP, and really good torque. The 351C-4V had 'quench' style heads, bumpier camshaft, made for performance intake and carb (I got to drive my friend's '70 Chero with the 351C-4V, and it flat-out flew!). If you want to know the numbers for a late '70s 351W with a four-barrel, look at the mid-'80s Ford trucks, before EFI replaced them; they had a 5.8L-4V available then.