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What's the difference between the 5 pin module distributors and 7 pin distributors? I've got one that's supposed to be an '88 with a 5 pin and an '86 that's a 7 pin. Schucks show them both the same. A GM site mentions a "Federal" module and a "Calif" module", no mention of how many pins. Neither of mine have vacuum advance. I understand there is a difference with them. Also, do they have a replaceable bronze bushing or are they throw aways?
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'86 S10 Blazer 4WD, '87 2.8 with 3.1 crank and pistons, A.R.I. "Stage 2 Cam", Iron Heads with stiffer springs, Holley TBI, Manifold bored to fit the TBI Base(4.3 size), Fiero Covers, MSD Coil, DynoMax Muffler and 2.5 Tailpipe, no cat, Auburn Limited Slip, 3.73 final Drive. 700R. '85 Fiero GT 3.4 Hybrid, relieved top intake and exhaust, 57mm TB, Auto. 3.06 final drive.