Might have trouble with the 4.10s and shift kit. I was talking to support at transgo the other day and he said if I'm going to bring my 3.27s down to 3.73s or lower it won't work well. He said 3.55s would be ok but not lower.
May want to call them and see what they have to say.
Depends a bit on how serious a shift kit you want. Transgo is the one my friend Jim has had the best luck with in his LT4 700R4 F-body. I think they're the only ones that have a different valvebody that comes with the kit as opposed to just different gaskets and seals.