I was thinking about getting a 94 LS motor swap, but i found out that the tranny is hydro. I know it would be hard to convert it from cable to hydro so i was wondering if my 91 LS tranny will be fine with the new motor and will it be able to handle the power that the B18B can produce.
Your current tranny is going to work fine. You just need to make sure to use a clutch assembly meant for your year (90-91) to mate up properly to your tranny.