You're comparing apples and oranges. Granted, both of them were built for Trans-Am racing, and only saw the street for homologation purposes, but they're totally different creatures in every way except firing order (and even that's labeled different, but if you overlay them you'll realize their identical.)
Are you talking about the Ford Boss 302 or just a 302 that has performance parts put in?
The Chevy is more like the standard 302 and won't compare to the breathing ability of the Boss 302. The canted valves and huge runners on a Boss 302 are in a completely different class. On the other hand the standard 302 and the Chevy 302 compare well if the right parts are used in both engines.
1966 Coupe 351W Top Loader rebuilt, rewired, modified for slalom and hill climb No racing - just a fun car built by and for me. Project in process
The boss 302 was 2 years then ford made the boss 351 and dropped the boss name and quit trans am racing.Trans am racing is why there was a boss 302 and 351 the same years z28 used a dz302 and amc built some special cars so they could race too.Most racing events will say a production car that's why cars like the winged mopars where made so they could run them in nascar.The ford thunderbolt was a factory drag car gm made a 427 66 belair i got a long list of cars made just for racing lol.