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Pre emissions engines should be using full vacuum for the dist vac advance.
Someone from Tampa Bay , dissing the Bears, the Bucs havent made the playoffs since 2008
44 seasons in Nfl ,30 losing seasons
Are the Bears playing today?
No vacuum on pcv when removed from valve cover is not right , plugging valve cover when the pcv is removed makes no difference. lf no...
Something else to look at is if the distributor needs to be shimmed, that can caused timing to fluctuate.
I see people still don’t get it with timed port and full manifold vacuum.
Which springs are in the distributor? lf they are both the light one, try one light and one medium, the curve could be starting
Do you have an adjustable vacuum canister?