GM's throttle body fuel injection only requires, like 6psi to run. Not totally sure as to what all else you would need. Probably the air flow sensor, for sure. Your other option would be an early S10 carburetor model, or mid 80s full sized car. Just need the electric fuel pump. You could cut the axles down, if you wanted it narrower, or a different rear end.
My Granddad had one he made. Powered it with an old twin Wisconsin, belt drove the 3 speed. Had a cut down Ford rear end.