I did get my EA81 in my 84 wagon to run well with my MegaSquirt controller.
I did not use the sub MAF sensor, only the Megasquirt MAP unit on board the unit.
I was able to measure the flow of the throttle body injector using the Megasquirt. The one I am using tested at 540 cc/min on my home set up. I only inject twice per engine cyle which seems to work OK. My pulse width is quite low at idle.
I am still doing some tuning and when I think it is all dialed in then I will post my setup file and a few hints for anyone else that would like to try to run an efi setup on an EA81 using a MegaSquirt box.....