318 Harmonic Balancer Question

Demonracer said

What year casting is the block, what year are the internals (crankshaft), what year is the balancer? If everything is not matched i. e., externally balanced or internally balanced the engine will shake itself to pieces.

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Don’t anything about the crank or balancer. I believe I looked it up once, and for some reason I want to say the engine is a ‘78, but not positive.

I can try and look at the casting number if the headers and starter are not blocking it.