you could swap damn near anything in that car.

ive seen:
2-3tc
4age( theres a snow rally twin turbo in japland)
silver top 4age ( ae101 or 111)
SR swap
S2k swap
12a 13b
7m
2rz
2jz
RB
correct me if ive missed any
ive even seen s15 rear sub frame and rear end.
plus you can turbo all the motors listed.