Computer location

Alright, this is a real quick and simple question. I'm about to order an 80mm MAF sensor through Granatelli, and I need to know what kind of computer is in my '87 GT 5.0. Now, the previous owner did a mass air flow conversion, hence the reason I'm looking to upgrade the diameter. I have a 70mm BBK TB and a BBK cold air intake.

At this point I know I have 19/lb hr. injectors, I just need to know what type of computer I have.

How do I go about finding this out. I hear the computer is located inside the car on the passenger side, but where? Can anyone walk me through the process of finding the computer? I would be VERY appreciative. Thank you.:D
 
mines (90) its in my passenger seat floor board, if your sitting in the seat... look at your feet.. its on the right on the side wall~! pop the plastic cover off but be careful the X-mas tree connectors break easy~!