Rotating assy balance

Here the problem lies is the caps may offset to either side, and dressing the sides of the rod, then the other side of the cap, may increase side clearance beyond acceptable tolerances.

You can usually match the cap to rod by scrutinizing/matching the hone marks . Done it a few times.
Prefer crank weight in side of counterweight, so it's "captured" , and can't fly outta the end of the counterweight on a missed shift over-rev. ( Ask me how I know ) .

I wouldn't use those rods or machinist .