Olddog,
When you change MAFs to need to change the MAF xfer function in the tune. To do that you need some tuning s/w. I would recommend you check out the Binary Editor (BE) from Clint Garrity click here =>
Binary Editor.
BE works with a hardware enhancement/enabler to the OEM CPU that is called The Moates Quarterhorse. The Quarterhorse allows you to tune in real time while the engine is running. Click here =>
Moates for more info on Quarterhorse.
Although there are a few aftermarket alternatives the BE/Quarterhorse combo is by far the most complete and capable option/alternative for the EEC-IV generation cars/CPUs.
When it comes to MAFs you ought to take a hard look at the Pro-M Racing's MAFs click here =>
Pro-M. These guys wrote the book on MAFs. The deceased company founder Bob Atwood was a Ford engineer who was instrumental in pioneering the mass flow FI system you are now working with.
Their MAF technology is right at the cutting edge of what is possible. They are the company that provided MAFs for SCT, Granatelli, Delta Force and a surprisingly long list of others.
I recommend you take a look at their Pro-M 92 MAF. As you modify your engine if you grow out the top of the MAF's xfer function flow table these guys can actually recalibrate your MAF to what ever air demand you wish.
If you are going to embark on tuning your fuel injection yourself you probably need to have both a broader and also a more in-depth knowledge of the internal workings of a Ford ECU. I recommend the book by Don LaSota called
The Ultimate Ford EFI Tuning Guide. The guide is available here =>
LaSota Racing
The finishing touch is an excellent course taught by Greg Bannish who has been employed by each of the Big 3 at different times to do their FI calibration (Detroit talk for tuning). Greg's site Calibrated Success is here =>
Greg Bannish. Greg has published several books on the subject of tuning that make good reading and are an excellent primer for his training courses.
Ed