New rebuild has odd vapors?

It might be a little early to tell with cast rings, they sometimes take a long while to break in,but
If your PCV can't make suction at the valve cover at idle, it is a sure sign that either it is not functioning, or it is overwhelmed.
I'd like to see a short vid of the PCV grommet, with the PCV flipped out, and all the valve cover openings plugged except the grommet where the PCV goes, and the engine at 2000 rpm.
Or you can plumb a low-pressure gauge to the dipstick tube.With the PCV properly plumbed, plug all other holes into the crankcase. Then start her up,watching the gauge. At idle,there should be a vacuum there. If the pressure begins to rise, watch closely. If it approaches 4psi, stop the test! We don't want to start blowing seals out.
Pressure means one of three things; 1) the engine isn't "broke" in yet, or 2) the ringseal is very poor, or 3) the headgaskets are leaking.
To find out which, the logical test is a LeakDown test.

White smoke in the exhaust is sorta normal as the engine is warming up. Water is one of the by-products of burning gasoline. It is in the air all around you ,all the time.But after the exhaust system warms up, it isn't usually noticeable. If you suspect the smoke is anti-freeze it will coat the inside of the pipe. If you swipe some out on your finger and touch it to your tongue, it will initially be sweet, then the lingering taste is not very good.