A quick Howdy before my question. I hopped over from Chevelle tech where I hang out often.
I have a '68 Jeepster with a '67 (I think) 340".
My father said he did help "detune" the engine in the early '80s to run on regular gas.

On to my question.
Is there a source for a harmonic ballancer for this engine or an equivalent?

Thanks Thom