You can't go wrong with the "cammer". It's already built to be a flexible alternative - wiring harnesses and elctronics are already done and available
http://www.fordracingparts.com/parts...tKeyField=6787
You probably want to read on the 4V Mustang boards for information on Sean Hyland. He is well know in the modular world but so is Al Papitto from Boss 330 racing. People also rave about VTengines.