Thank you for that information, I as always appreciate good input & advice! I think I have 600 miles on this motor & only one plug looked like burnt oil on it (in the picture).
So I need to have the plugs out, coil wire out. Turn the motor over say, 4 times & read each cylinder pressure?
While we R here, is there anything I can put in a cylinder that might help a problem here?

1953 Chevy 153A 3/4-ton
Working on my project since 2015
Follow along in my DITY