Sorry I did have a brain fart on the Mach 1. The 1968 Fastback 428CJ was the quickest.
The Boss 302 is most definately not a standard 302 windsor. It's a different block with 4 bolt mains at 2-3-4, and screw in freeze plugs.
The 351C 4V heads are NOT the same as the Boss 302 heads. The Boss 302 heads are more aggressive than the 4V heads. The Boss 302 got bigger valves than the 4V heads in 1969 (which doesn't really matter for 1971), and they flow better. So quite frankly, I love your comment. Show a little respect and research the subject before jumping in tearing it up. The Boss heads also featured closed chamber head design, single groove valves, larger valve spring seats, milling for guide plates and rocker studs. While SOME of the 351C heads had SOME of the upgrades like the Boss heads, most did not, and it's doubtful they had them all.
The Boss 351 was rated at 330hp vs the 351C-4v's 290hp. Not that the ratings really meant anything back then anyway.
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