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You *could* run it on 93 octane without a problem, depends on motor exclusively... My pontiac had an original 400 and it could run OK on 93, but that gets expensive after a while.
If the 350 is not a high output version with high compression ( like SS or comparable ) , I'd say you'll be ok with whatever the dealer/seller says they run it on(Just not 87).
Until it starts knocking, which my pontiac did on heavy acceleration with 87.
What leaded gas did was keep the engines from "knocking"- premature detonation that harmed them. We don't use it now because it destroys catalytic converters, and causes gross pollution.
I'd say 20 miles per gallon is the very very highest estimate for mileage, if it was a manual and had "granny gears" from factory. Proceed with caution. Dougie probably knows more about this specific model than I .
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