[Big-Foot]

StanJ - While I disagree about the primary and secondary throttles needing to be actuated in a linear fashion, I am intrigued by your baffle for the power-valve.
It is something I have given a little thought to in some of our cars since we properly install jet extensions, but leave the PV to suck air under hard acceleration. Of course this is only relative to those carbs that have a secondary PV, but very much a potential problem..