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You could but due to the large open area, I would be worried about it coming off the eccentric and hitting something or getting hung up in the chain and damaging the engine, or more importantly, your finger.
I think you might be thinking of something like a small block Chevy that uses a pushrod between the eccentric and the arm on the pump. The small black Chrysler is not like that, the arm on the pump is what the eccentric operates.
There is a woodruff key (like what goes in crank snout to keep a harmonic balancer from spinnin on the crankshaft) on the end of the camshaft. The end of the camshaft has a threaded boss, a large washer goes on to hold the eccentric into place and a bolt in the end of the cam holds the washer...