68 307ci oil foaming at oil filler neck

[soba_03]

Ok here is what I got, the PCV valve is new and plumbed correctly into the air cleaner. Earlier today I noticed that I have some oil foaming in the oil filler neck. Now this would not concern me much. But i had to fill the radiator up. Here is what i know. I had to replace the carburetor because it was running lean (sucking air) this caused the truck to run hot. So I wasn't concerned when I saw the radiator down a bit. I don't have an overflow bottle, it vents on the ground. So low is to be expected.

But I put about 1/2 a gallon of antifreeze, and checked the oil, down just a smidge so I went to add and the filler neck was foamed and I immediately trickled down my leg....

I have not owned the truck to long, I'm not seeing anything otherwise to be concerned with. I'm thinking that this is to be expected.. Please confirm or deny my thoughts..... am i going to have a problem with this?

Regards,
Soba