As I explained in a recent story (June 2002, page 78) about how to convert to mass-air, non-adjustable EEC-IV speed density can't really compensate for an engine that's modified to flow more air. I suppose you could install a better intake manifold, but that's going to obviously increase airflow, which will likely affect driveability. I'm curious-why are you reluctant to convert the car to mass air? It really is a logical next step in a car such as yours. Once it's done, then you're all set. You can do just about any modification there is as far as improving airflow for the engine. The owner of the '86 GT I converted in that June how-to reports the car runs better than ever. He said the difference in driveability was like night and day. So, even on a bone-stock 5.0, converting to mass air is a good idea.
The story I referred to above clearly illustrates what's needed to convert an '80s 5.0 to mass air. You can do it one of two ways, by either buying the FRPP kit new (for automatic-equipped cars, order PN M-9000-B50) from such sources as Dallas Mustang, or call a Mustang salvage yard, such as Mustang Parts Specialties (770/867-2644, www.stangparts.com), and maybe save a little money in procuring the parts used.
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