I've had an LS in my CR for a few years now. Ran a carb until recently and switched to FI. Joyridin' is right about the
oil pans. I think they supply one from a hummer on the crate engines. I have an LS1 corvette pan on mine, it's the shallowest. A nearby race shop built my present headers. My first set were the ones I had on my sbc before the LS. Just cut off the flanges, spread the tubes and welded on new flanges. Never liked the pinch bends on those and wanted larger tubes so...
Good luck and enjoy!
-Greg