I know of a 700R4 (yeah, I know it's chevy) that responded way better to a trans-go valvebody over a shift kit for firmer shifts and holding gears. While you're in there, might as well do it right.
so will the shift be firm and crisp or will it be like stock and sort of delay??
plus people always talk about VBs being expensive, i found a TCI one for aod manual/auto VB for 190$
If possible, buy the valvebody and put it in. I did a kit in one of my almost dead C4's and it kept it alive, but I put a TCI valvebody in the C4 I rebuilt to go in the car, and it was awesome!