slant six to 318…???

i am head off to colleage Dec. 7th my slant six is shot after 380k miles i cant do anything but rebuild it dont wanna spend that kind of $$ so a friend said it would be cheaper for me and him to put a 318 in....is that true if so what is a decent price range i will be looking at??? by the way its a 1970 plymouth duster with a 22nci in it....or i guess what would be the best thing to do while still having a dependable engine and a low price???i would even buy a slant six if someones got one for sell...or 318..let me know..bignateduck@yahoo.com
Author: Snoman001