Hmmmmm...
How about just getting a MSD 6AL for under $200, and you get a better ignition box along with rve limit control??
Old School yes, but it is a proven upgrade 
LOBE
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1991 Mustang GT, 1 5/8" Jet-Hot coated BBK Long tubes, w/ matching shorty o/r H-pipe, Flowmaster cat back 2 chambers, 3.55:1 gears, Kenne Belle RAM Air (may be removing), Underdrive pulleys. , C&L 76mm Mass Air meter, 65mm FMS TB. Soon to be added intakes and then HEADS.
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