the website for S&P is: http://www.hotrodlane.cc/

they are located in Arkansas...so they probably would be too far to do work for you, but if you give them a call they will send you a free catelog. they also sent me a dvd all about the LT1 (in my case) tips and tricks to know when putting one in an older car.

an ls1 should go right in with a set of SBC mounts. i don't know about the tranny...most use the a 4l60e auto or t56 manual, but I don't know which others match up. if you look around their website they have install layouts you can look through to get an idea.