Need some help on this. I have a 68 400, original engine, T400. Had an overheating issue, which I solved with an aluminum radiator and vacuum plumbing adjustments. In the process, my PCV hose moved from the intake to the Holley carb. I now have oil pushing out the dipstick (AC car) onto the head and exhaust. I tried putting a breather on the passenger side valve cover (M/T aftermarket), and that resulted in rough idle. So, I have two questions. Is it possible that the carb port is not pulling enough vacuum to properly operate the PCV valve? It is the correct larger port on the choke side of the carb and the PCV valve is new, but I have not tested the port with a vacuum gauge. If I put the breather back on, can I solve the rough idle by simply adjusting the idle mix screws? I'm not good with timing adjustments, so trying to avoid that. Otherwise, it's a trip to the shop.

I could try moving the PCV hose back to the intake, but that would mean Tee-ing off my transmission vacuum or power brakes. The Holly carb does not have a vacuum port on the back side. Appreciate any guidance. Thanks!