Depending on what mounts (1st gen, 2nd gen, marine, Lord isolators, etc) your motor mounts will vary to the frame. The only real way to do it is put the engine on a hoist and start cutting cardboard.

There are some build that will give you a close idea but nothing that you can throw in without test fitting.

Take your time and the payoff will be so worth it. Other than SBC swaps, there are no drop in kits or how tos really.