You need a lil more than square or you will have a tip-in sag or hesitation, as the carb transitions from idle, to low-speed pulling; or even just from neutral to in gear.
When you set the transfer slots like this, and you must, then it will be rich. That is why you bring in the bypass air, to lean it out,back to normal. Then you set the idlespeed with timing; whatever it takes, or doesn't,lol. That will get youa baseline. If your engine is sluggish with the lack of timing ,you have two choices, well ok three choices;
1) fix the IABs so you can run less bypass, so you can run more timing, or
2) get a higher stall TC, or
3) more TM (TorqueMultiplication), aka gears.
BTW,
2500 is not likely gonna be enough stall at 6000 ft
The 3.73s might work
BTW,
With the numbers provided, your Scr maths to 12.2. That sounds pretty good. But remember that your Dcr starts from when the intake actually closes, so at 81* that comes to 8.4Dcr@6000ft. With alloy heads that is a good number. But the cranking cylinder pressure is only predicted to be 142psi, so you know, that cam is killing your idle-pressure. But I'm sure you built it like that for a reason.
However, at 6000 ft, the EFFECTIVE compression ratio at idle will be extremely low, and you may have to settle on a slightly higher than usual idlespeed..