'65 904 total end play

Finally getting this 904 back together (after spending $130 for a 4 clutch forward drum assembly, as I couldn't find a piston for my 3 clutch), and I want to make sure my total E.P. isn't too tight. .028 +/- with the tailshaft hanging... that's with a .071 fibre washer on the front of the output shaft. The only other one I've got is .053, which would kick me up to somewhere around .045. I've done some searching, gone through my books, but these old units are so different from the newer ones that I wanted to double check. Thoughts?