??? Harmonic Balancer for 1966 273 Commando

I've swapped out all the '69 and earlier balancers without any problems....273, 318, 340. They all have the timing indicator on the passenger side in the same relative spot. You can use the '70-1 balancers too if you're willing to remark the TDC slot on the balancer. The '72-up are the same way but you also have to slot one of the holes in the crank pulley to match the even pattern of the later balancer. If you're building the engine, I'd get it balanced along with all the other recipricating parts.