Rod and main clearance is a balance of those clearances, the top end oiling and oil weight.

.0033 on the mains is fairly common. Then going .002 on the rod. With aluminum rods fine sense they grow. May have been to tight when considering it's fed from the main. Only #8 is fed from #5 main. Where as the middle journals are feeding two rods each. The rear main wasn't upside down was it? Look at the #5 main bearing.