Greetings all.
Its a sad day when we pull the car covers over for our birds for winter hibernation. Time for some work.
I just did the heads in July because of a bad valve seat in #5 and now all compression checks out at 150 psi with no leak down. Valve lash has been checked several times and are spot on. Vacuum is steady at 19.  The car runs silky smooth and is steady. However I may have had a carb issue as well.  When I disassembled the carb from the intake I noticed the carb gasket was a bit wet over the the front carb bores on the manifold. My 2 very front spark plugs ( 1 & 5) are heavily carboned. The next two (2 & 6) are carboned up but are a bit lighter and the remaining 4 are all the same and less carboned & much cleaner. It is about 6 years old & has about 22,000 miles on it. The reason is I am asking is that I am experiencing fuel in the oil. Does this sound like a carb rebuild.
Stock 312 Y block

If the car's down for the winter, you might as well do the carb, as it doesn't sound right. Try to find a kit designed for our new fuels.

Fuel in the oil can also be a leaking diaphragm on the fuel pump, not bad enough yet to quit completely

I'm inclined to blame our current ethanol fuel for a lot of problems. That includes the rubber hose from the frame to the fuel pump, or anywhere else there's a rubber hose. Look for debris and residue in the float bowls and needle/seat. Plugged air bleeds, etc.

I don't do "restorations" so I use all modern rubber fuel lines. I've had some mid 90's EFI cars where the rubber hoses failed internally from the ethanol.

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ