You can get the 1" set back swap mounts for $40.00 off of ebay, that's where I got mine. If you use a 4.8,5.3,6.0 truck motor, the stock truck accessories will fit except the a/c compressor. There have been a few people that have had clearance issues with the power steering pump. You can get a smaller pulley for it, from your local parts store. Mid length swap headers for a ls conversion in a s-10 pickup will fit without issues. The are around $250.00. Pacesetter 98-02 f-body long tubes will fit with some minor mods. You have to dent or reroute one tube on the passenger side. On the driver's side, the header kicks out at an angle on some cars, but can be fixed by heating up the headers and carefully bending them straight.
If your going carbed, don't buy the edelbrock carb conversion kit, it is a rip off. Get a msd 6010 box, and either a Edelbrock performer RPM or vic JR intake depending on what your goals are. The most popular carb. I have seen on the conversions are a proform\quickfuel. If your going fuel injected, you will need to buy a custom engine wire harness for the specific car your putting it in, or make one. You will also have to program\tune the computer or have someone do it.
If you are going to use an old school transmission(Th-350, TH-400, 700R4, etc.) You will need a spacer that bolts to end of the fly wheel, so the torque converter has proper spacing. You can get the spacer and the new longer bolts from your local GM dealer. Part #12563532 for the spacer, and part#12563533 for the bolt. You will need six bolts. They sell them individually.
For the oil pan, the one with the most ground clearance is the caddy CTSV pan. The 98-02 f-body oil pan will work as well, but you will have to modify your cross-member the pan sits above with the engine installed. If your car is stock ride height or lowered an 1" or less, the muscle car pan will work. Anymore than that, use the ctsv\f-body pan, unless you want the pan slamming into a pot hole. I got the muscle car swap pan kit for my car. It includes everything(pan, pickup, dipstick, bolts, windage tray, and gasket). If you go with the ctsv pan, you will have to buy all that stuff individually(much more expensive). You can get the swap kit from your local GM dealer as well part# 19212593. If you are going to order GM parts, I would suggest getting them from sdparts.com. My local stealership wanted gold plated prices for the parts I needed.
Hope this gets you started on your swap. ls1tech.com has a massive thread dedicated to g-body lsx swap. There is a ton of good info in it as well.
http://ls1tech.com/forums/conversions-h ... hread.html
I'm in the process of doing\documenting my 5.3 swap in my cutlass. When I get it done, I am planning on doing a detailed write up with pics on how I did it. I'm waiting for the warm weather to finally show up here. It sucks having a single car non-heated garage in the frozen north.
Gonna start the t56 mock up soon! Headers on the other hand aren't on my mind for now seeing as i have to pass emissions's
