Goin' through a 904

Recently I bought a 76 360 with a 904 tranny from the junkyard. It was in a 76 cordoba. I took the 904 to the trans shop today for them to go through it. I'm building the 360 to between 300-350 hp...nothing spectacular. Do I need to do anything special to the 904 to beef it up? This will be a street cruiser, not a drag car, and I will occasionally boil the skins, but not rag it too much.

Suggestions?

Also, I'm looking at a 2 for 1 deal. The other day when I got in my 69 GTX to back out of my garage, reverse was gone. The 727 laid down on me. I'm hoping for nothing major, but guessing a band broke, and that after the 904 is back, I'll be pulling the 727 from the X. Any hope for an easy fix? The fluid is topped off.