Brainstorming ideas for coolant crossover on Air-Gap intakes

I googled elevation Ft Collins and see you are at about 5000ft.
I wonder if you are experiencing Icing in the venturies.
Icing usually occurs at temps closer to freezing, at sealevel, but is not uncommon at temps even above 60*F, depending on the humidity.
A lot of initial timing will cause the butterflies to operate at very small openings,which promotes icing.A large venturi, and or a small cam may also lead to icing. If you have all three,you may have a recipe for icing.
You may benefit from; less initial advance, a spreadbore carb,and/or more cam.This will get your butterflies open a little further, and perhaps minimize the icing.5000ft also needs more Scr. A 9/1 motor will struggle to make heat.
Another option is a heated carb-spacer, like they used to put on certain Fords back in the 70s
Another option might be a deflector to prevent the rad-fan from blowing under the plenum
I gotta tell you tho, The very first winter I had my combo together, I ran it deep into October, with no problems, and no choke. 360/292-508cam/AG-750DP/aluminum heads/ 900ft elevation/TTIs. Timing was 14/34@3400. Yeah it was a little cold blooded for a couple of miles. But a 205*minimum running temp and a thermostatic clutch-fan, put some heat in her in just a short while.

What are your cam specs? Do you know the ICA? How 'bout the compression ratio, or cylinder pressure numbers.