Daniel, you mentioned its a 2 pcs. rear main seal, if its a aftermarket crank then its probably internally balanced. It could have a 400 crank with spacer bearings for external balance.
Any chance you might know this or could ask from whoever you got the engine from about the internals. Do you have a pic of the crank flange?
As inexpensive 60 buck option to try an internal balancer?
Do you know the cam specs and what are the plugs like?
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1969 Camaro SSRS
Simon
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