How interchangeable are 318 harmonic balancers?

Well, now. This is interesting.

In terms of timing marks and keyways, the balancer out of this vehicle looks very similar to the pictures of the "good" balancers that George Jets posted above:

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And as TT5.9mag pointed out, "slipped is slipped", so they're either right, or they're not (I'm paraphrasing).

(Or I did the TDC check right, or I didn't.)

I guess I won't know until the new TC set arrives, as I sure as he** won't be turning anything until I get this buttoned-up again:

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As for the bolt holes, they're not symmetrical, which, if this was a US vehicle, would mean "69 and earlier", according to Professor Fate.

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But this is a '71 vehicle....

...the VG model had a lot of hybrid parts in them.

Amen to that!