Super Six Idle Issues... Bit 'O' Help Please!

So I just finished the "Super Six" conversion on the wagon... factory 2-barrel manifold, Holley 2280 from my Scamp parts stash (ran great 10 years ago on the 318, I rebuilt it, of course), Lokar throttle and kickdown cables...

I've got timing set at 8° advanced at idle, mixture screws set to give highest idle/highest vacuum, the engine idles at 700-725 RPM in gear with the idle speed screw backed all the way off. With the 1-barrel, it idled 100-150 RPM lower...

If I place my hand over the top of the carb, it takes a good 30 second for the engine start running crappy, which tells me its already too rich...

The car runs fine, except that it gets hot in traffic now. Used to be dead steady 195° all the time, now after 5 minutes or so, in stop-n-go, (hehe, i'm a poet and I didn't know it!) the temp starts creeping up. My theory is that the trans is loading a bunch of heat into the cooling system because at that RPM, it wants to move...

I remember the old trick of drilling holes in Holley primary blades to bring adjustability back to the carb, and I seem to remember reading that Carter BBD 2-barrels had their throttle blades drilled for Slant 6 applications.

So, any suggestions??? I'm considering drilling the blades a last resort, for obvious reasons, I'm hoping someone out there has the magic fix, or suggests something that I've overlooked.