Any specs or standards that you are requiring to keep. I mean anything is possiable (maybe not a good ideia of worth doing but it's all possiable). I've seen video footage of SJ 410's with Turbo rotary's in Purto Rico turning 11's in the 1/4 mile.
I'm sure the EFI SBC has been done.
Grass Roots motorsports magazine
http://www.grmotorsports.comTheir was a guy who stuck a Built v-8 in the passenger side of his Datsun 410. AND a Ford V-6 front wheel drive into the rear of a Festiva is another popular swap. It's all in what you have the $$$ and abilty to build. ANd just when you think Naa they'd never do that... You see it for sale on EBAY...