Ford sold various elestomeric balancers for the Cleveland, The wts varied from 9.6 to 12.4 lbs with them getting heavier as the advertised power of the engine went up; the heaviest was on a Boss 351 or a 351-HO and the lightest was on a 351-M in a pickup. The balancers all took a 4 bolt pulley.
I THINK they all had TDC marked in the same place even though there were two or three different timing pointers. I would definitely find TDC on your own engine with an indicator disc regardless of which balancer you buy. Note a 9" disc will work on engines in a car while 12", 14" or 18" OD discs will be more accurate but will not fit on installed engines in a Pantera, only if mounted on a stand.
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