Gears are great, but he was asking for horsepower estimates. Not really possible without knowing about heads, cam, headers, and induction. Even how the short block is built makes a bunch of difference.
I like the Performance Trends program to get a little insight into what an engine might produce. Maybe more important is where in the spectrum of RPM, the power is produced.
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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