Oil misting from dipstick tube - blowby?

Hi guys - Thanks so much for all the ideas- I'm going to try to respond to all:

I have seen this thread, and another thread, mention the specificity of "PCV = Drivers Side, Breather= Passenger Side" - Why do the sides matter? I have them switchted right now, as the pass side valve cover has the hole in the rear, and I was trying to keep it clean, with a nice straight shot to the back of the carb (1/4" npt on edelbrock carb)

Absolutely ZERO smoke, or anything coming out of exhaust - Cleanest the pipes have ever blown on this car (since rebuild)

The stripped short block was taken to Carquest in Northridge, Harlan is their machinist - Has a pretty good reputation in the San Fernando Valley - I took block to him when I realized I couldn't afford Valley Head Service, as they were doing the cylinder heads and broke the bank. (All SoCal places for my distant A-body people =) )

#2 Piston was rusted to cyl wall, so he overbored the entire engine 30 over, I brought him the Keith Black Pistons and their matching moly rings (KB167-030). http://www.summitracing.com/parts/uem-kb167-030 All other bearings were standard thickness.

The engine is the casting right after 1976-> (casting #4006730) (the thinwall casting everyone talks about) Everyone who has looked at this engine has agreed that it is a virgin block - no rebuilds ever.

Heads are real boring casting: #4027163 Nothing crazy done to them.

Comp Cams K-Kit was used - K20-223-3.

The initial oil dumped was 5quarts Mobil 1 synthetic 5w-30 with a added bottle of Lucas zinc Break In additive - I know this wasn't anywhere close to the proper way to do it.

I'm going to change over to standard 10w-30, as the initial oil and filter should come out now anyway, and I will report back.