When i had to pick between keeping my modded sohc 4 dr neon sport sedan and keeping and t2/5spd swapping my spirit, i decided to ditch the neon and do a bunch of upgrades to the spirit..
The spirit as a lightly modded t2/5spd car at 11 psi is not ANY faster than the lightly modded sohc neon. It also handles worse and gets worse mileage. It does seem to be more comfortable and safer, though.
Anyway, i just think its a silly swap. Ive got silly swap ideas of my own so im not saying its the stupidest thing ive ever heard.. but i agree the only time it really even makes sense is if you already have a nicely modified 2.2/2.5 that needs a body and arent going to be spending money to build one.. because if you have to spend money youd be better off just spending it on the neon motor.