Harmonic balancers outer rings slipped or cracked at the keyway isn't all that uncommon.
I would NEVER for any reason buy a used one, the rubber between the hub and outer ring is at least 50 years old at this point and harder than the counter tops in my kitchen, plus cracked and loosing all it's memory to keep the outer ring in place.
Pioneer replacment balancers are excellent, the SFI version even better. The stock replacement DA-4551 are in the $60-80 range. At a minium go that direction vs buying a used one that needs a sleeve over it and probably ready to throw the outer ring off it anyhow.......
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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