Mass Air Conversion

I am looking at MAF conversions for my 87 gt and my question is what is the best MAF conversion, there is ford racing kit but I see a mac mass air conversion as well for $200 cheaper. You can also order the mac conversion kit with a Pro-M 75mm for the same price as the ford racing kit. Is there a better kit or are they all pretty much the same?
 
Here's some thoughts...

MASS air conversion instructions from http://www.stangnet.com/tech/maf/massairconversion.html FREE
A9L (5 Speed) computer from junkyard $100-$150
A9P (Auto or in a pinch, 5 Speed) computer from junkyard $100-$150
70MM MAF from 94-95 Mustang GT - $40-$70
MASS Air wiring harness kit $30-$85

The whole thing is probably less than $300 using junkyard parts.

A9L computers are 5 speed only
A9P computers are automatic , but will work with a 5 speed.