sr20 for 240

can the sr20 bolt right up to the stock transmission if you do an engine swap?? or is it a different setup?

you need the SR transmission. see my other post for the reason you should wait to swap motors, but when you do, just look for a complete swap. it comes with the motor, trans, ecu, wiring harness. the stock motor mounts, drive shaft, and exhaust all bolt up. you just need a downpipe for the SR to connect the turbo to the exhaust, as most swaps wont come with one.

and how much overall am i looking at in cost for a complete sr20 swap?

if you do the whole install yourself, about 3k, give or take whatever you can get for cheap.