MSD Digital 6A and HEI

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I am thinking of going from my HEI with upgraded coil and module to a MSD 6A. What are the main benefits in doing this?

Is there a difference between using my HEI dizzy and switching to a pro billet with vac adv? I was thinking of keeping the HEI till i can afford the new dizzy unless there is no benefit.

Any thoughts and/or info on this would be great.

Incase it is needed I am running a 383ci sbc at about 10.2:1 compression and a 230* .510 lift intake and 236* .520 exh @ .050 hyd roller, AFR 195cc Eliminators and a 2 1/2'' exhaust, and a 750 vac sec speed demon.