Mike, what is your source for engine casting? Mine disagrees but could be incorrect… motor books workshop, how to restore your Chevrolet pick up by Mike Brownell it seems I read somewhere where improvements were made in ‘39 from the original ‘37 216.
I know the clutch is a one year thing, but were these engine changes external and visible or internal?
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Larry
Old man᠁Old truck᠁neither one goes very fast. All you need in life is TIME, PATIENCE and MONEY.
If you are missing one component, you'll need an abundance of the others two.