[Shon]

I have the adaptors to run a Th400/350 on the LSx blocks if you need them. We had a ton made for the local jeeps we do the swaps in.

and we normally just take the LSx flexplate and redrill the TC mounting holes.

TCI makes a kit that has the flexplate and spacer, if you want that kit let me know.

Just look at the current FP and see if it has the crank spacer behind it, the 6.0s sometimes do and if that is the case you do not need anything, might have to redill the FP but otherwise you are good to go.

as for the bellhousing, the LSx has 8 bolts, to put the older GM trans to the newer motor just use 6 bolts, a 7th might line up but we just use the 6bolts.