32RH 67 Dart

I just recently started a new project with a 67 Dodge Dart 270, 273 V8, A904 trans that's in pretty decent shape. I read up on some of the benefits of the A999/32RH transmissions and happened to come across a 32RH from a 97 2500 V6 van and bought it for $200. The story goes that it was rebuilt 25k mile ago and he replaced it for a 4speed OD.
I've gotten a little frustrated trying to look up the SN of the trans, so hopefully someone can help me out. (see picture)

From what I have researched it's pretty much a straight bolt in swap. Here are a few questions I have.
The stock 7 1/4" rear end is coming out, and an 8 3/4" with 3.55 gears is going in. If I left anything out, I'm sure you all will let me know.

Any advice or help is greatly appreciated!

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