FYI only, in case anyone is interested, I swapped out the "bad" cam and installed my old Alquati 40-80 intake cam.
I adjusted the clearances and checked timing. C/L is 105ATDC. Target is 107-108. Will adjust tomorrow.
BTW, this cam, as installed now, producdes 190psig cranking compression. the "bad" cam only produces 165 or so - much more duration. Or the rings seated between now and then.
This cam has about 243deg duration at @0.050 cam lobe. 234deg valve lift @50 as installed.
Timing data is attached for curious souls. I did two sets of measurements at valve open and two at valve close. The results are surprisingly consistent. I set the timing wheel with a piston stop plug and checked after done.