What’s the best new high hp motor that will fit in a 72 Scamp?

Sad but true !
Chysler Fiat stuff is so dam high $ wise , its about only for the rich and famous . Dam sure lets me out .

What's so sad is, Chrysler had something to compete with and BEAT Chevy up to the advent of the LS. It seems like after that, Chrysler has really "given up" trying to give hot rodders an affordable alternative to Chevy crappola.