I'm finally in a position to re-assemble this engine and run it on a stand. I went to test-fit the intermediate shaft and distributor and check the end-play. The distributor does not have a groove for an o-ring but it does have a gasket/shim under the mating flange. The gasket/shim looks like a steel, embossed, crush type gasket. When I mount the distributor on top of the block and engaged with the intermediate shaft there is zero end-play in the gear train. In order to have any end play the shim/gasket needs to be in place. So is this shim available? I am guessing that if it is crushable then it is a one-use item? It looks to be in pretty good condition.
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