If you would even think of doing the 389, make sure you have a good trans, hydramatics can get rather expensive to rebuild, than you have to find someone who can do it correctly.
Someone here on this board could find one or have a 389 for sale.
With the hydramatic 4 speed, probaly closer to 15 or 18 mpg. Depending how heavy your right foot is.
I probaly spent over $2k on my engine, you could find one of the Pontiac vendors that post here for a quote for a complete rebuilt.
"Turnkey and go" how much is that for a complete engine plus fuel injection? Plus trans and rear end. They have fuel injection for Pontiacs now too. If you want to put a Chevy in fine, but fuel injection for anything is expensive. All i'm saying is for 350hp a 389 would be cheaper to build. Plus Pontiacs have way more torque at low rpm than a sbc.
I bored my 389 out to a standard bore 400 , fitted 400 pistons and have the big valve heads. For a low compression 400 you could get some 71-newer heads that would keep your compression down low.
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Illinois Outlaw Gassers
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