Question for those w/o PCV system - fumes

[DanEC]

My ERA has a nice, not too rowdy Keith Craft engine with very few miles and no signs of any issues. I don't have PCV but I have a breather oil fill cap and a manifold breather at the back of the manifold. Nothing on the valve covers.

I get the usual stench of a couple drops of gas dripping out of my rear carb shooter on to hot throttle plates after about 10 minutes heat soak after shut off. I've done about all I can for that with carb heat shields and insulator gaskets.

But, I've noticed when warmed up and pulling up to a stop light or when pulling into my driveway and stopping, I get a real acrid exhaust odor that waffles over the top of the door for a bit. I'm guessing it's when my radiator fan has kicked on. Seems odd as there is no sign of issue with the motor and then it dawned on me - is this crankcase fumes I'm smelling that are circulating out of the engine breathers and getting blown underneath and out the louvers when the fan kicks in. This is while I'm driving so it's definitely not gas boiling off anywhere which has a different odor. Anyone else with a non-PCV car noticed something like this? Sound like what's happening? I've been around awhile and have several 60s era cars but they all have PCV.