415HP from 318ci IS POSSABLE!!

Ok I don't know if people still see this post but cause we're on the subject of Mopar and 318's 340's 360's 400's and maybe others, I was wondering if I can get some help? I am thinking of getting a 1973 dodge charger but my problem is I don't have alot of cash so I was wondering if getting a 1973 dodge charger with a 318 ci engine is a good idea?