how much horsepower can the 904 take?

So far I have not been able to find a performance torque converter for my 64 pushbutton 904.

Are you just looking for something on the shelf...??? Or have you spoken with PCT, Dynamic, Frank Lupo; people who build converters?? To be honest, you are not likely to find a converter on the shelf for your car, I suspect though, you could get one built. It will cost some money, but it will be built to your specifications.

Check it out.............