LA318 stock to mild build harmonic balancer suggestion.
A local shop in your area might be able to replace the rubber ring and save you some money. Otherwise Summit has on for $100 but read the reviews before you buy.
1969 DODGE DART Summit Racing SUM-163273 Summit Racing™ OE-Style Harmonic Dampers | Summit Racing
I think you can use this one with no weights bolted on.
Professional Products 80012 Professional Products PowerForce Harmonic Dampers | Summit Racing
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