new to the site greetings all,
so i have run into an issue with my gen 1 sbc. 1963/327.
long story short getting very little to no oil pressure on a fresh rebuild. i discovered my oil pump shaft and distributor shaft are not seating, they are missing by approx 1/4" the cup on the end of the distributor gear just touches the pump shaft causing it to turn at low RPMs.
i have heard there were two different lengths of oil pump shafts that will work on these early models is this correct?

***it has been changed from coil to hei*** any suggestions?
thanks,
Chris