Yes the SR will fit in the 240.......it was meant for the car.
As for the price, theres no simple cut and dry answer to that. The price of the car will vary, so will the price of the motor depending on who you go to. My advice, check the Daily News and see what they go for. Check out AutoTrader.com to see whats out there.
www.srswap.com has info on the motor, so should
www.ustable-hybrids.com. There are others out there, just do a search on google.com to see what you come up with.
As far as getting it to pass, you will need someone to help you out in that dept. here in NY.