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i think they ALL got a 2 barrel carb- i've never heard of a 4 barrel Chevy 307.
i believe the 307 replaced the 2 barrel 327's, and the 350 was used where 4 barrel 327's used to go. the 307 was later dumped in favor of weak sucky 2 barrel 350's, and in 76, the mighty 305 came on the scene.
i don't know how much power you can get out of a 307, but i do know they are dang near bulletproof in a daily driver economy application- similar to a Mopar 318 or a Ford 300 inline 6. they just don't die even when you want them to.
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