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'85 Fleetwood FWD
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Where is your transmission modulator getting it's vacuum?? It should be manifold vacuum. I doubt if the vacuum could change much with things disconnected like you say. The big Caddy engine has plenty of vacuum. The kick-down switch shouldn't have anything to do with normal up-shifts. The modulator does though.

BILL
 

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'85 Fleetwood FWD
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The EGR is supposed to be operated by ported vacuum. It opens the valve between 2 and 7 inches of vacuum, and stays open with 7 and more.

The charcoal canister is also ported vacuum. The other items are manifold vacuum, according to my manual.
 

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'85 Fleetwood FWD
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Sounds like you are getting it under control OK, with the mods etc.
Edelbrock also has a plate the goes under a square bore carb, on a spread-bore manifold, to adapt that carb to in. I use one on WEIAND manifolds, for the same combo.
 
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