Old man with old car, new here with questions

Hi Dan, the hose vacuum line at the carb base is connected to the inside of the dash

Whoah-whoah-whoah. That's wrong. The heater vacuum hose is meant to connect to a fitting on the № 6 (rearmost) intake manifold runner. That carb fitting is for your PCV. Can't tell from these pics, but perhaps your '62 was neither a California nor a New York car, and has the old road draft tube instead of PCV, in which case see here.

The power brake booster comes directly off the intake manifold and then tees into a vacuum tank located in the front drivers wheel well.

That's correct—if your manifold fitting has only one large nipple for the power brake hose, and doesn't have a small nipple for the heater vacuum hose, you'll want to either get a fitting that has both sizes or tee off the large hose connected to the intake manifold.

I have ordered a voltage reducer for the divorced choke

Interesting idea. Can you point us at what you bought?

The question I have to finish the fuel system off is to find a grommet for the fuel fill line to the tank.

The '62 cars didn't use a grommet like the '63-'66 cars. They used an O-ring, part № 2073 938 (buy one here) and a rubber-over-steel seal plate № 2242 359 (buy here). Starting in '63 the rubber-over-steel plate is the same, but the O-ring was replaced by a sturdier grommet № 2203 473. I don't know whether or how easily one could upgrade to the '63+ grommet, but if you want to try, you can buy one here.

They also cut off a small piece of the metal fill line.

Ugh. When repairing this, make sure to route the vent line correctly. It needs to rise way up high, then make a U-turn and head back down and out through the trunk floor. If no high U-turn, you'll piss gasoline out the vent.