Chrome ignition module vs rev-n-nator

Did you have to adjust the timing as a result of it running leaner
It was a little "Fat" at idle before. It's just not quite as fat at idle.
Leads me to believe it is getting a better burn.
.040 over Stroked 340, 418 CI, full roller cam, solid lifters, Eddy heads straight out of the box, Quick Fuel 650 DP, LD340 intake, 340 exhaust manifolds, 480 HP @ 5700 RPM and 511 Torque @ 4300 at the crank. 4 speed car