53Therapy,
Do not force the pump down! Don't run it yet!
Just encountered a like problem where the distributor was real tight going down the hole before the gears and oil pump got properly seated.
Found the top of the new oil pump is machined a few thousands to small and is deflecting to one side enough to cause the mis-alignment when tightened up.
Fix:
Pull the pan and loosen the oil pump lock jam nut and bolt. Float the oil pump and try the distributor on the hole. It will most likely slide down easily. Remove the distributor and slide a feeler gauge blade on the opposite side of the pump locking bolt. I started around .002, tighten the locking bolt down on the blade and re-try the distributor. Repeat using thicker blades till the distributor slides in slides in easily with the oil pump lock bolt tight.
Cut off the feeler gauge and blade that is now hanging out with sissors or knife.
47 Fleetmaster, Hotrod 6, 5 Speed
50 Sedan Delivery, 327, 5 Speed
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