The front suspension is a weird setup. You won't be able to utilize the front knuckles/hubs as they're completely different from the 240.
The rear subframe won't fit as it's HUGE compared to the S13.
I measured it around an inch and a half wider than the S13's. Which is about right. The J30 track is an inch wider than an S14's, and the S14 is 10 mm wider than the S13, which equates to a little less than an inch and a half. What I did end up doing is chopping up my J30 frame and welding the reinforcement plates from it into my S14 frame.