fuel...
Black smoke is fuel...
The usual suspects for poor idle:
vacuum leak
timing
tps voltage
bad iac
btw, I have a b-cam and it lopes but idles at 750 and doesn't budge.
I have 24 lbs too and 40 psi is too much I think, you should be around 38 psi tops.
good luck...
__________________
1988 GT Convertible
331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta...
One week with new motor, two speeding tickets...joy
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