The Coupe is something like 1560 and sedan 1585 weight wise.

California Rally Series as a bunch of rally-x dates. All you need is a helmet.......courses are defined by cones , it's good sideways fun. Check Californiarallyseries.com for dates.

As for the Sedan just check it very closely , a bent frame on these cars is real obvious. As for the motor mods if you want to rallycross you don't need a bigger motor, a good driver can win stock class with (and has) an auto-box rental car. If the car is in good shape here's what you do; put a roll bar in it (bolt in) a good seat to hold you in place , grab some used rally tires (CRS rally guys will have some cheap) slap some decent shocks on it and drive the snot out of it. After a bit find an A14 and replace the A12.Keep an eye for a limited slip diff while you continue to have some more fun. Just upgrade the car as you find stuff cheap and run it for a few seasons.
Engine swaps are great but you need to uprgrade everything at once......remember it has brakes intended for a 68Hp car......so you will quickly have 10k in a $550 car.

Tom