That 202 ebay ad you linked to was $250 on a changeover basis, meaning you need to give them an old 202 as well. Then you have to find a gearbox, linkages, radiator, possibly starter, alternator etc. Best bet is to buy an entire 202 auto car. You should pick one up for $500 with a bit of rust, that way you have everything needed and you're able to test drive it beforehand. You'll probably be able to sell any leftover body parts as well, might even make your money back if it's got good guards and bonnet and some decent interior bits. I've got a 202 HZ wagon but it's a manual and probably a bit far away.

As for fitting it, buy the manual, get a few mates around and go for it. If you can operate a ratchet you should be able to do it. Pulling the nosecone and rad support off makes it nice and easy to remove/install motors with gearboxes attached. Label things and take photo's as you pull bits off and just put everything back where you got it from. Jennies mates must have been drinking a real lot if it took them several weekends, or they were distracted by the hot chicks hanging around the garage watching them work. If you had 3 or 4 reasonably handy mates helping it's easily a day job.