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, 24# injectors, F303, MAC shorty headers, BBK off road H pipe, Flowmaster 40 series, BBK CAI, Ford 4.10 gears, SR Perf Upper and Lower control arms, SR Perf Full Length Subframes, Ford Racing "B" Springs, Eibach Pro-Dampers, A/C and Smog deleted, built AOD with low 1st, 245.45.17 up front and 275.40.17 on the rear.