hypothetically....
96 or under contour..... 1200 ish
small block chevy .... 2000 ish
turbo 350 tranny .... 500 ish
custom driveshaft .... 250 ish
ford 9 inch rear end ... 800 ish
mig welder to make it work 250 ish
these prices are a bit high and would give you a decent setup. althoug im forgetting prices for a custom leaf spring and traction bar setup for the rwd setup. i think this is quite feasable for less than what i just made up from the top of my head. but as far as fitting a sm block 350 i know it would fit as ive measured my friend sm block in his s10. 350 focus are getting popular to and there is one that was done for less than 5 grand. the focus swap is a bit more appealing for just the thought of a focus fliping out and killing a cobra for no reason. just a thought. i think a 302 would be even cheaper.
blah