Since you have an autolite 2100, you have 2barrel intake and carb.
You might find a good 2barrel for it, ot just move over to a 4barrell setup like this:
4barrell carb: If you want new the best bang for the buck is probably the Summit 600cfm.
if you have to have edelbrock, i think the cheapest (500cfm) with electric choke is:
for the intake use either the weiand 8124 or the edelbrock performer
check out suggested parts, as you will need the gaskets as well.
check on the water temperature sensor you currently have in the intake, what size is that (there's the thing and thick ones). The new intakes will use the thick ones. I can't remember what stock intake uses. Worst case just order both
in a stock distributor there's not much that actually can go wrong:
- the points are worn -> replace with condensor or upgrade to pertronix module
- the humps are worn which open the points ->upgrade to pertronix module
- the shaft has play (you can move the shaft forward and backward) -> I would trash the distributor and replace with aftermarket
- the bearing is a bit dry. a few _drops_ of oil right into the middle of the shaft
- the springs are worn or rusted->replace and lightly oil the weights
- the vacuum advance diaphragm is not holding vacuum (suck at hose connected to vacuum canister. it needs to hold the vacuum. if you can suck air through it it's gone) ->replace the vacuum canister
- the advance curve needs adjusting (probably in any case)
Generally you can't set ignition properly with vacuum leaks and you can't adjust a carb when the carb is not doing it's job.
So where exactly do you have the vacuum leaks and can you check onj whats wrong with the distributor? maybe just adjust the points and timing and see what happens ?)