Mine did have 2 pumps, and the "spider" feeding air into the exhaust. Hopefully this pic will help.
I did use this diagram and looking into the engine compartment to determine what was what. I believe all I kept was the vapor canister and the essentials. (trans., vac advance, etc.) Most of my lines had rotted off, but were still laying on the intake.
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'86 C-30 dually, 454/tbh400
'73 K-20 350/350/205 (sold
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I'm kinda like duct tape- no real purpose, but handy to have around.