.050" numbers are lower than what Summit is showing for that cam.
My old MP catalogs show those specs as well. Maybe they changed them over the years??? This is the paperwork that came with my cam...
Only pic I have of this car.
Was a super clean low mileage ‘68 Coronet.
Sold it to a guy in Sacramento in the early 90’s. Found it at the Sacramento U-pull-it a few years later - T-boned. ☹️
Fairfield, Ca. cruise was shut down in 1985-86.
Traffic congestion, sub-woofer/loud stereo thing was getting popular and the guns started showing up...
Spiders nests in the main gas orifices may be a regional issue.
It was a problem in the Bay Area - California.
My wife also had recurring issues with this in her wall heaters in rural Arkansas.
Sounds like you have either a bad gas valve or blocked gas orifices (little green spiders can crawl in the orifices and make a nest blocking gas flow - seen it many times in my 22 years in HVAC)
Also, make sure you have gas to the furnace.