Where can I buy a reliable remanufactured 318 for 1971 Duster?

at tree-fiddy you can barely get shops out here to give you the time of day, that's hella cheap.

all kidding aside, i think you *might* be able to get a block tanked, mag'd, spec'd and maybe a hone on the cyls for that kinda dough. maybe. heads would easily be that or more for a skim, mag and checking the guides & heights.