the rears its just a matter of getting the right length, then you modify the mounts to suit, for example, a mate of mine is usuing front coilovers out of a skyline in the rear.
As for the front, if you do a search on s13 front end, you will get the answer you need, you get camber, track and bigger brakes using s13 gear, ca stuff is very cheap, sr stuff is a bit more pricey but the brakes are worth it