[blucar]

Excellent write up with a lot of work to solve a very simple problem; how to get good ventilation into an engine.
The one problem I see with placing the PCV adjacent to the oil fill tube is that in order for crankcase ventilation to work you have to have a fresh air source that is drawn through the engine and into the intake manifold to be burnt off in lieu of escaping into the atmosphere.
Placing the PCV so close to the fresh-air source will draw the fresh air into the PCV and not through the engine.
Placing the PCV into the manifold in front of the carb will create a better path/route for air circulation with-in the engine.
I like the PCV system that the '63-64 292 V8 truck engines used. The rear draft tube is eliminated in favor of a metal bonnet that fits into the block, a line runs from there to a location in front of the carb. The PCV screws into a hole in the manifold. Fresh air is drawn into the engine block via the oil fill pipe at the front of the engine.
I have attached a couple oCV system on my '57 T-Bird..