Hi. New here and looking for some advice. Just got a 65 GTO and am starting to restore her from the ground up. Car came with a 400 in it but I have the original 389 block, crank, pistons and heads. There pretty rusty from sitting out on the salt air. Wondering which motor to invest in for rebuild. Want a weekend warrior when done. Not a 1/4 car but a red-light runner. Would like around 400 horses. Any advice would be appreciated.