The other option to consider would be to drill out the normal air by-pass passages even further (the ones I showed circled in RED in my photos) and then enlrage the passege in the base plate that actually feeds air into the motor as it by-passes the throttle blades.

Since I have no access to any type of drilling equipment (and boy, you have to be super careful and precise there, I'm thinking a machinist type of a job) I simply couldn't try this.

The additional problem, certainly in my setup, is the fact that I am running an open plenum spreadbore-to-squarebore adapter. Therefore, the signal, as little as there is of one with the bigger cam is bled off even further by the opposite bank. I am currently on a hunt for either a 4-hole spread-to-square bore adapter, or a Canton Racing 85-254 spacer which should preserve some of the signal. Either way, it's a crap-shoot...