You probably don't want the vac gauge in the link you posted. The 1/4" NPT fitting on it will make it a pain to hook it up to anything. Go to Sears and get one, they have a nice gauge with a simple vacuum hose for connecting to a car.
The two thermal switches that you've pictured can be left off of your new intake completely. They're not doing anything now and aren't needed for anything. Heck, they both have broken off nipples anyway, so are pretty much useless. As you guessed, the one with "EGR" on it is the EGR control switch. The other one is most likely for the TCS (Transmission Controlled Spark) system. Another unnecessary emission device.
No need to get a new valley pan, they don't wear out. Just put a new gasket on yours if it's leaking.
If you go with a standard Edelbrock Performer intake, don't be too surprised if you don't notice any actual performance increase.
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'72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car!
'73 Firebird 350/4-speed Black on Black, mix & match.
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