Re: Wobbly Harmonic Balancer?
If the harmonic balancer wobbles on the crankshaft, you should bolt it on.
Before you can do this, having a 210 HP V8, the crankshaft snout may or may not have been drilled & tapped for a bolt. Check to see and buy the bolt/washer combo from the parts store Help aisle. If the h/bal has a loose rim on the hub and tight on the shaft, get a new h/bal. They are under $60 each.
If losing 10° of timing while idling, I'd check the carb setting of mixture screws along with maybe unhooking full time manifold vacuum. As engine slows down, so does vacuum, vac timing changes also. Once carb is adjusted for smooth running, and it reads like its doing good otherwise, hook manifold vacuum back up.
Could be fuel starvation either to carb from the fuel pump as in bad f/pump or new gas cap needed as it is not venting, or weak valve springs - built-in rev limiter has kicked in.
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