PCV and Breather question

I recently did a carb swap on my '65 170 auto to a Carter BBD (made for slant 6 application - curved PCV fitting, thick choke airhorn, and no bowl vent fitting). The car runs beautiful. However, I am now seeing small amounts of smoke (no oil) coming from my oil fill cap (front black cap in photo). Is this normal? The PCV is connected by hose to my carb via the curved PCV fitting on the rear of the carb. The PCV valve was checked, and cleaned and is working as it should. I have capped all the fittings on my carb except for the fittings for the distributor, and the PCV (which are hooked up) just like in this diagram.

20190517_102439.jpg

BBD diagram.jpg