How much to rebuild a 904 trans?

I've been quoted $300 & $450 from my two transmission builders, if I bring them the trans. That's using Raybestos clucthes. Right now I'm using a stock 904 with a shift kit and 2800 stall converter and have no problems. BTW, a 904 trans will be faster in the quarter than a 727, due to less horsepower required to turn the 904 internals. Longevity might be an issue, but not in your engine examples. Go with the 904.