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Hi Karl,
A. If your distributor bushings for the distributor shaft were not reamed with one "long" bushing reaming tool, (which aligns both the top bushing and the bottom bushing concentrically), either the top bushing or the bottom bushing, or both distributor bushings could be possibly misaligned; and,
B. If so, this misalignment could cause the distributor shaft to bind on only a smaller surface of the bushing(s) when rotating; and,
C. If your distributor shaft is binding as such with no amount of small clearance, enough heat can be generated to cause your metal distributor shaft to expand, bind, and squeak.
D. Also, if your distributor shaft is binding, and if enough heat is generated to make your distributor shaft squeak, your oil pump and distributor drive gear below may have lots of frictional stress and this delicate gear could wear quickly.
E. With such a "possible" distributor shaft and bushing(s) misalignment, it would not be a bad idea to remove your distributor and distributor shaft and investigate if there is sufficient binding to cause this distributor shaft to mechanically malfunction.
F. While disassembled, with distributor shaft removed, never a bad idea to check to see if the distributor oil hole is not plugged where oil can easily lubricate the distributor shaft.