[Khobra]

Hey all, I'm new to Club Cobra and just recently discovered this forum. Really enjoy the read.
Was wondering if someone could help me with this combination. The intake is a C7ZX off a 67 Mustang Shelby GT 500 428. The carbs I'm running are Ford P/N 5752426, which are 600 CFM units, basically 1850s. I'm running #60 jets on all corners and it works great. My problem is a rich idle. Running in my garage it burns my eyes. I've tried everything I know but can't seem to lean it out enough.
Power valves are 6.5

Additional info is as follows:

Cam - Comp Cams, Roller, 282/288 adv duration, 521/532 lift.
@ 0.050" 230/236 deg duration
Lobe sep is 110 deg.

Anyone have any ideas?