306
I put a 302 crank in my 289 block. It's bored .030" over, so it's actually a 306 CI. A 289 with it's shorter stroke might be able to spin a little faster than a 302, but only minimally. My opinion is that for a street driven car, you shouldn't set your engine up for more than 6000 RPM anyway. You can do that with a 302 without too much trouble. Anyway, I think the 302 is the best choice.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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