'66 Slant Six Turbo Build

First - I'm not a big boost guy....lol. But in regard to this passage:
"I've always know flow in lb/min and pressure as two different things which are related.
PSI is measuring density and flow lb/min is how much air is moving through the system and how quickly. Flow lb/min is ultimately what determines your peak power."

I'm not sure it I agree. As I understand it "flow" is the output of the turbine. It's dependant on the rpm of the shaft (the exh side) and the compressor side size and design. PSI is the measurement of the resistance of the intake tract to that flow. A great port will indicate less PSI than a bad port with the same compressor being spun at the same speed. It seems to me that the port is way restrictive (which fits every '6 peice I've read...lol) and you're blowing a lot through it. That may be messing with the signals the carb's getting and giving you the lean condition too.
I'm still in a learning curve for these engines but I'd definately look to make the ports work better. It will help with any turbo upgrade later.