Yes all of the MS ecu's will allow you to run with a dizzy . It's somthing you'll need to specify to your builder when you order .
It's best that you join one of the DIYEFI r megasquirt forum's as there's some base map's avalible there to get you started . However i would advise you to change to wasted spark and as a add an EDIS 4 unit to your to buy list . Can i ask why you've chosen MS3 ? MS2 is more than capable and there;s an awful lot more support avalible for it as . Also i'm not sure if there's a stable code avalible as yet .