How much to rebuild a 904 trans?

Some people just don't know better, I have a friend who races Pro Gas, so everything is about speed to him. He thinks I need to pitch my 904 and 8.25, so that I can make fast gear changes. He doesn't understand that I'm not going to race this car very much, and i'm SURE not going to swap gears just to go to the track.

I am pretty much trans-stupid. I work on anything else, but trannys are a pull and replace item for me. I understand the 904 can take an extra clutch/disc for more power, and I think you can cram 2 in there if the housing is machined to give you more depth..or something like that..I dunno:banghead: . But it's also not needed for a mild build, that's more for a race build.

One local car club member quoted me $550 to rebuild my 904 (if i bring it to him). That's for a build that'll stand up to anything I can throw at it with my 360, with a shift kit and good internals. He built the 904 in his 10 second race car, and it's been in there for two seasons, so I have faith he knows what he's doing.