horsepower

molallastang.....molalla,oregon..just got handed a fully restored 1966 mustang coupe (parents gave to me) and it has a very tired 289 (only thing they didnt touch) need to try and get 375 to 400 horsepower out of it...is it possible without breakin' the bank? gunna enjoy this site
 
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Depends on your bank and what you have to start with. Generally speaking, 400 hp will cost $3000-$4000 to do right. You can cut that way down if you have superior swap meet skills, get lucky on ebay, have a great short block to start with, etc.

My suggestion would be to buy a good clean late model 5.0 and put a carb manifold on it with a decent cam. You might get that done for $1500 or so.