"and i was also told that the way to make mechanical injection streetable is to mount a small tank in the engine compartment that the main tank feeds into."

Hopper, you've got to start thinking for yourself. If it was that easy, don't you think everybody would be doing it. Bottom line, NO.

"what is a good cheap chassis that makes out to be a good strip/street car?"

O.K., hold onto your hat, here's the secret......light car, big motor.

Let your imagination run wild.
....Neon with a 440 Mopar wedge.....MGB with a 460 Ford.....early Datsun truck with a 500 Cad Eldorado mounted in the rear complete with trans/diff......Chevette with a 454 Chevy.....and on and on.....