I hear this o-ring can be tricky even when used with a stock setup/correct geometry. So are there any tips or procedures when having to use oil pump spacers (which would screw up alignment even more)

ENGINE IS IN TRUCK, not on stand

I'm just about to the point where I'll have to start putting this thing back together

 

Went just fine for me last night. 1.5 hrs getting the bolt out, 5 min to put it back in with spacers installed.. haha