I recently inherited my uncle's 65 Mustang, 97000 original miles, 289 2 bbl, auto trans. The tranny is leaking fluid and the motor is covered in oil, needs rebuilding. I can rebuild the motor, but need advice on the tranny. Is that a DIY or should I have it done, or purchase a swapout? I also would like advice on any mods I should make to the motor, such as electronic ignition. The car is in great shape, no rust except on the rear bumper, but does need to be painted. Thanks for any and all advice.