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I'd try removing the belt(s) and running it first. Could be something up front out of balance. As for a "balancer" for the front of the crank...not really since the engine is internally balanced and the only purpose an elastomer or fluid hub would serve is torsional damping,and likely nothing at 2200 rpm.
Might also try with clutch held down...that eliminates the clutch disk and transmission.
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"It don't take but country smarts to solve the problem" (Smokey Yunick)
'41 Merc Town Sedan / 260" 8CM engine
'66 Fairlane four door / "warmed up"
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