Mustang Monthly has an artical this month on a Paxton supercharger kit for a 65-68 Mustang. Wonder if it would fit under a II hood??? 115 extra horse power. http://www.paxtonauto.com/systems_1001839.html
I've thought about that system before, no idea if it fits or not though :-\ Do you have a link to/scan of the article?
I think that Mustang Monthly will add the artical here. (likely when the Sept issue of the printed mag goes on sale?) http://www.mustangmonthly.com/techarticles/index.html The artical in in the August issue of Mustang Monthly The hood clearance would be the thing, I was looking at 1965 Mustangs, and there hood is really flat and the engine compartment looks really deep. The II has a sculptured low hood so
http://s155.photobucket.com/albums/s309/IMACHU2/?action=view¤t=Mustangengine.jpg http://www.paxtonauto.com/systems_1001839.html It looks close to me.
Anything will fit with a larger enough mallet or an angle grinder. Hell, who would have thought that a twin turbo 383 would fit in a Pinto?