ok, put a punch mark between the pin holes, then clamp the end of the shaft that is closest to the distributor in a vice but put a rag around the shaft.
put some assembly lube on the part that the gear will be then install the gear to around the same distance the other one was
next you will install the distributor WITHOUT the clamp but push it down until it is seated.
next try to put your thinnest feeler gauge between the gear and the block . then push down lightly on the top of the shaft then try to remove the feeler gauge.
you want the gear so it is around .005" from the block but because your block pad is now grooved, this will be hard to measure.
after this, you can install the front cam gear and barely tighten the bolt, then put white grease on the dist gear and install it then rotate the cam one full turn then post a photo of the dist gear.
NEVER EVER BEAT ON THE SHAFT UNLESS IT IS IN A VICE OTHERWISE YOU WILL INSTANTLY RUIN THE DISTRIBUTOR BEARINGS