I happen to have a factory NOS 848 head right next to the other one for comparison.
Looking at the bottom of the rebuilt head, it looks like very little was milled, as 1/2-2/3 of the numbers on the corner are still readable and there.
Also the intake valves were shaved to an entire smooth surface.
I only have one gasket and can't do the clearance test unless I find and waste another felpro kind with the steel borders.
But all the new ones are the copper sandwich kind.
The block and cam is stock 1962.
I guess since the head wasn't milled as dramatically and the valves have been shaved, clearance should be fine without any shimming or other mods.
Thanks for the experienced advice.