Wow! Someone is pretty fricken ambitious. You have made it this far and honestly I'm amazed. From what you've shown already I believe you could probably rebuild this yourself and make it work correctly. The only issue is if you make one small mistake you can destroy a lot of your brand new parts on your first test drive. That said, what you should do is buy a full overhaul kit with all frictions and steels, and a atsg guide if you don't already have one. Go through the trans from one end to the other step by step replace all the soft parts, CLEAN all the components spotless and use the best looking parts from both transmissions you have. When your done, if you do everything correctly you should have a trans that works perfect the rest of the time you own the car. If you need it back on the road ASAP you should buy a used trans and bolt it in. Then maybe build the other as a spare as time and money allow.
