Oil Leak from breather cap (56 Buick Special)

got an issue with a 56 Buick Special 322 nailhead. After hitting 60mph or so, oil starts oozing out of the oil breather cap and down the rest of the engine. I've changed the cap several times but it keeps happening. The only modifications has been the Offey 6pack manifold and the triple deuce carb system. Any suggestions on this fix? Thanks.

 

Clogged up draft tube would be my guess.

 

Run a leak down test. I'd bet you have pressure going into your pan from a broken or bad ring. Don't run it anymore until you do a leakdown. You could be scoring your cylinder walls.
Harbor Freight has a fairly good unit for a cheap price.
http://www.harborfreight.com/cylinder-leak-down-tester-94190.html

 

Still have a PCV valve? Does it click when shaken? If not time to clean or replace.