Wow. That's gonna be some crazy weight distribution right there haha. Maybe the motorcycle engine or a compact rotary would have been a better choice? But what the heck do I know, best of luck!
EDIT: did some searching and while I now realize the rotary would be unreasonably difficult, this guy's build is awesome enough to almost make it seem worth it haha:
http://www.rx7club.com/old-school-ot...3b-rew-910929/