318 crankshaft specs

Ok then.
Was the engine balanced when built????
If the answer is yes????
If the answer is no??????
It does not make a difference.

The pistons and crank where not made together as an assembly.
Using a new crank means a RE-balance.

His new crank would have been balanced to a stock piston weight from the factory.
The assembly has to be rebalanced for sure,and knowing what the factory balanced each years 273\318\340\engines to helps if you have a choice.
All cranks are not balanced the same, even 318 cranks.

Just because you have a modern .060 over piston,how does that eliminate a balance job :scratch:
Any good motor is balanced.
This motor was possibly never balanced in the first place.