idle dies

Cam?
Carburetor?
What is your idle rpm?
Rpm in gear?
Vacuum at idle?

Did you set your initial timing at or near max vacuum? I'm not an expert by any means but from my experience the more initial you run , the more you have to reduce the curb idle screw (lower the rpm), which shuts the butterflies more covering the T ports, which gets you into the idle circuit. Check your throttle cable too because it can hold open the butterflies. Unhook it and make your adjustments just to be sure.

At idle, around 650rpm or so, check timing mark. Should be pretty steady. If it is bouncing around your mechanical advance may be kicking in which would cause it to bog and die when put into drive.