@fdugn545-Do you know if your vacuum advance in your dizzy even works? I ask this because a few months ago I was tracing down an issue on my b2000 and found out mine wasn't working. I searched hi and low for a new one and couldn't find one. I eventually found one for a 2.2L motor and modified the actuator arm to work in my dizzy. I wrote a little piece about how I had to modify it in another thread on this site. I'll see if I can get the link to that thread.
http://www.mazdabscene.com/threads/141246
The reason I ask this is if yours is not working then you may be better off choosing the EDIS4 setup.
I have been contemplating doing nearly the same thing you are doing. I've tossed around doing a V8 and a V6 swap, but I think for less money the SOHC 8V carb'd FE motors can be converted to EFI for little money in comparison to a V8/V6 swap. The way I am thinking about doing mine is NOT a sequential port injection but a hybrid of multi-port. Basically I'm going to cut and weld two injector bungs halfway down the intake runners just before they split to the two intake ports. This should make the carb'd intake still retain some of it's design functionality as a wet flow intake. (I remember reading in some hot rod mags years ago that an intake designed for wet flow, ie. carb intake, doesn't flow as well when converted to a dry flow system.) Hence why I said my idea will be a hybrid. The injectors will fire as a batch system like the TBI's and early TPI systems. As for controlling the throttle I will fab an adapter for a single throttle plate that will be between 40-50mm in size. My whole plan/idea is to this on a junkyard budget with parts from various different OEM vehicles. The biggest expense will be getting the MQ2 or MicroSquirt hardware. Eventually I plan to turbo it with a small Subaru or Mitzu unit with no more than about 10 psi max. The one difficulty I running into is the same as you. How to control the ignition for boost? I've considered contacting some of the aftermarket ignition companies to see if they can take my OEM dizzy housing and put new electronic controls with the ability to be controlled by ECM. Thus doing away with the vacuum advance and giving it much greater adaptability.