You can get a Ford crate engine 392 for about $6000 with out intake or headers. It makes 430 HP with an Edelbrock single plane intake, Holley 750 DP, and Hooker headers according to Ford. Others claim more like 450 HP.
Probably the cheapest HP you can buy for a '65-66.
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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