Mopar 727’s are pretty simple, I’ve built a few. The most important thing is to have a good manual or step by step video to follow. You’ll probably need some bushing drivers, good lock ring pliers, feeler gauge and a compressor for clutch springs. I made my own compressor out of stuff that was sitting around the shop. The basic rebuild kit is usually frictions and seals, you will likely need some bushings as well. To familiarize myself with the process, I disassembled and reassembled the trans a few times using the original parts. Once I figured it out, I disassembled and cleaned everything up again before assembling it using new parts.