Are you running the smog pump / system? If not, you can pretty much junk all that. I do not have smog system (delete) on my car and ripped all that stuff out.
1991 Mustang LX 5.0 Convertible. 302, GT40 Heads, GT40 Intake, 1.6 Harland Sharp Roller Rockers, Accufab 75mm TB, BBK 75mm MAF, BBK CAI, 24# injectors, F303, MAC shorty headers, BBK off road H pipe, Flowmaster 40 series, Ford 4.10 gears, SR Perf Upper and Lower control arms, SR Perf Full Length Subframes, Ford Racing "B" Springs, Eibach Pro-Dampers, Smog deleted, rebuilt AOD with 4r70w gears