Replacing a crank shaft questions

like_A_pike said
My engine is a 1971 340 (august I think). Externally balanced.
I have a manual for 1968 and the only thing it says regarding identification is whether I have a Maltese Cross stamped on the “numbering pad on the right side of the block” . It may have undersized one or more bearing journals by .001. If it is stamped with that cross and an X All of them are .010 undersized.
Is this Maltese Cross Id still true in 1971 or 72? Do I need to worry about it if it’s heading for the machine shop? Where is this numbering pad? Will any LA crank shaft work or is there something specific I need to target?
Thanks in advance

71 340 was internally balanced. The factory didn't throw a crankshaft away if it needed a tighter bearing. They just used undersized bearings. If the crank is not worn or grooved and just needs new bearings it really should be miked to get the correct oil clearance. (within spec) Pull the engine and the crank, check it or have it checked. It might just need a polish or a .010/.010 turn to be made correct.