My .02, buy a sawzall, skip the body lift. The added COG, the leverage the taller body mounts cause the body to shift around more during wheeling, they look like crap, even when you build the bumpers too match.
You really don't need any extra room for the tranny, or distributor, but you will for the t case shift lever after you raise the body. I don't remember what tcase you have, but if the stick is mounted on the tcase, ala 205 or 203, yui really won't be able to use the shifter boots if you wheel it. The shifter pivot moved two inched below means the hole thru the floor has to be a lot bigger to account for the extra body shifting, and the swing of the shifter. There is enough movement the body can potentially knock the shifter out of gear...
It takes very little trimming to make 37's fit , especially with 6 inches of lift!