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If the timing is set correctly and all vacuum parts are not leaking then the idle should be good if every thing else is correct .When the static timing is set then the engine should start easy. When you tip in the timing will be a little retarded and the RPM will build a little slow until the timing is advanced ( automatic ) When the engine is at idle there is full vacuum .So the design uses the vacuum to advance the timing at idle so tip in will build RPM quickly before the distributor can advance the timing as needed . In the real world if you set every thing correctly and block the vacuum lines then the car will start well but rev slowly at tip in until the distributor advances .
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