The oil spurt holes should face up (towards camshaft). The rib on the rod and the boss on the cap face rearward on the left bank. These face forward on the right bank. There is a notch on the top of the piston that faces forward. Caps and rods should not be interchanged. See attached pix from shop manual.
Piston, rod, cap have to be marked for the cylinder number before disassembly. There is only one part number for a rod, although it changed through the years. First part number used was 1385362. This was superceded by 1240016 in '74. That number became 1241938 in '75. These may be cast into the rod or also the number 1374563.
So stamped numerals on rods do not indicate cylinder number. There may be forging numbers on the rods like 561 or 942. Meaning of the 2, 4, 8 marks is unknown.
Clearance between the rod and the crankpin can can be checked in place with Plastigage. Clearance for a new bearing should be between 0.0002 and 0.0023". More is permissible on a used bearing. With bolts tightened down, rod should move freely back and forth on crankpin as allowed by end clearance.
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