Brainstorming ideas for coolant crossover on Air-Gap intakes

That's a pretty good combo.
With a Lunati 10200701 having specs of 256/262/112 in at 111 the ICA would be about 59*. On a 10.5-360, the Dcr would come in at 7.72(corrected to 5000ft) with 153 psi cylinder pressure. The math says at sealevel a 550 carb would be a good all-round choice. At 5000 ft it should be more than enough.
Since you have run the smaller carb too, how would you compare them?
If you set this smaller carb up to run at 5000 ft it will not like to run down at 1000 ft, so the bigger carb could be set up to run there. And then 15 minutes later you will be ready to go.


I wouldn't go more than one size bigger with a FT hydraulic cam, on account of any bigger and it will loose Dcr fast, and that means the bottom-end gets soft, and that leads to a higher stall TC, and probably gears. A bigger cam will make more power on account of it will pull in more air at higher rpms, but the trade-off is at the other end.
Having said that, a swap in cam types, will give you one or two camsizes bigger, with the same 59* ICA. So a solid FT, or a roller would work. But I think a small roller like that would need to be a custom cam. So you would probably be left with a solid-FT.
You are on the right track with attempting to run the fresh air.The engine will make more power on the denser air, and at 5000FT this is a challenge.If you can figure out a way to keep the icing away, you will be in good shape.
With your current cam, and at your altitude I can totally see a stock TQ/C.I. intake working.The iron intake will be much slower to change temperature, and the TQ with smaller primaries will run with the butterflies open a little further.
Just remember to reset your T-Port sync with any carb change.
If you currently have 3.23s I dunno if I would be in a hurry to buy 3.55s. Especially if you can already spin the tires with the smaller gear. But if you have less than 3.23s, swapping to 3.55s will cause the car to cruise with a smaller primary opening, again.
So in conclusion; If it was my car, and I could not solve the icing in any conventional way, I would be shopping for a CI/TQ set-up.

Just for kicks,tho, I would first try running a tankful through her with max-strength gas-line antifreeze. The isopropyl-alchohol kind. If your problem is at all icing related, this will kill it.
Good-luck!