[chris vickery]

I assume Richard that you used modern replacement bearing and adjustable lifters?
No need for fancy motor oils or additives.
On your first test run, start your motor up and slowly rev it up and hold at a medium RPM for a few minutes. You can run her up and down a few times but I would suggest to not run more than 15 or 20 minutes and dump the oil, replacing with fresh oil at the end of the test run.
As clean as you got the engine back from the machine shop, there will still be debris which was lodged away that you will want to get rid of (filings, assembly lube, dust, grime etc.
I believe the zinc additive was used during the time of hand poured Babbitt bearings and the like...