I have the same 8 3/4 setup with the mw spool 35 spline axles 1350 yokes and joints. My 499 makes 650-700 h.p. my car weighs 3740 with me in it. foot brake. 8" 5000 converter. Only has 8 passes on it but its not broke yet. Im going to run it. I cant afford a 60 and to build a 9" that will hold up it would cost the same. I spent all my money building this stupid 8 3/4