i'm going for a 03/04 mustang cobra engine in my next project, but they are big engines,

if you want simple go for an ford/chevy small block, on carb, they can give good hp and are smallish, if u want 500+ i would say go modern engine with a whipple supercharger, it all depends on budget

ebay.com you will find bellhousings to fit most stuff to a t5, t56, tko type of box