Fixed.
Part Link to C158
Just installed Borg Warner cap #C158. Took the car out, ran it for a bit, works great. Funny thing is my car was actually idling about 300rpm higher than normal after I installed the new Borg Warner Cap. I can't imagine the terminals moving that much between caps for more achieved advance. Will recheck timing next too. The new one snaps down and locks in place nicely. Bought it at Kragen/PartsAmerica for $18, is grey in color like stock, three year full replacement warranty. Sort of a suprise really... Just a tad more snap/crackle/pop now and the motor winds smoother and faster to the higher RPM range now. It seems my former MSD cap must have been failing and had become degraded for a tad longer than I had suspected. Indexed or not, so far so good.