Vacuum line questions

I am trying to to clean up the vacuum lines on my 89 motorhome with a 460. Back in 89 I think it had air pumps, fuel tank vents, carb fuel bowl vents,,,etc all connected. Now it is missing most of that and I want to clean up all the vacuum line connections. I guess I should connect the ported vacuum from the carb to the dist, and to the EGR valve with a coolant temperature controlled ported vacuum switch and a integral backpressure transducer valve (if I can find these). Main vacuum will go to the C-6 transmission's vacuum modulator and to the PCV thru another main vacuum connection. I guess I have to find the fuel tank vent and carbon canister as well as a purge valve (if I can find these as well). I also have a vacuum gauge mounted in the dash which I plan to reconnect. Last night I installed a new Holly carb (080570 {4150 570CFM}) and I can't get the idle down below 1000rpm so this is the driving force in cleaning up the vacuum lines.

Does anyone see anything else I need to address with the vacuum lines. I plan to check the carb out again and maybe reinstall the old 4160 carb (600cfm) and see if the idle returns to the 700rpm I had before the carb swap.

89 460 in a M/H
89 302 in a Mustang
93 F250 diesel 7.3
2002 Ranger 4L

Well I removed the carb again and replaced the gaskets for the EGR valve and carb and now it idles at 700rpm again but the secondarys hit the EGR valve and stick partly open. I will have to adjust that tonight. Maybe the new 570cfm carb will increase the fuel mileage a little over the 600cfm. I guess I will see. The 600cfm will soon be residing on my 48 truck so all is well....