I had a little oil coming out like that from the dipstick tube at high rpm on my 340 with no pcv and I put a Chevy style umbrella type dipstick in it and and cured that problem. Just had to make marks on the Chevy stick for full and add with a file.
Yeah the guy who used to own the car said he had oil coming out of the dipstick, so I’m guessing / hoping that this is a crankcase pressure issue from the ventilation system not being set up.