high stall 904 converter

Looking for a used 9 1/2, or 8 inch converter. Don't care if it is for the early small pilot/spline, or late large pilot/spline, or combination of either. Will be running a slant six, so if the converter is from a V-8 it would need to be about 5,000 rpm stall. That would give me somewhere between 3,000 and 4,000 rpm. Trying to put together another low dollar car, using mostly parts I have on hand. Remember I'm frugal (my wife says cheap). Kind of testing the waters right now, to get an idea of priceing.