Best distributor with 40IDF carbs. References not clear?, Trying to determine which is best for new 2056 build, 2l heads Options

[jjs3rd914]

Building a new 2056 with dual 40IDF weber clone carbs, New AA 2l heads, WebCam 086 cam,

There are numerous threads about "009, 050, 205" etc, etc, which seems to refer to known shorthands as to how to refer to the various distributors.

Some seem to reference part of the Bosch number , others part of the VW number and it is very confusing for those of us not as knowledgeable as many of you.

So here are the distributors I have in my stash and am seeking advise as to the best one for daily driving with my new build.

1. Bosch 0231181009 VW 022905205AA Which is suppose to be from 74 914 1.8L
2. B - 0231176048 VW 021905205A-B 75 914 1.8 for California?
3. B - 0231137009 VW 113905205K From 66-67 Type 1
4. B - 0231167070 VW 113905205AN From 72-73 Type 1 (have 2 of these)
5. B - 0231129019 VW??? From 49-53 Type 1 and 55-59 type 2. I think this one was used Formula Vee racers as is pure mechanical advance only, no vacuum.

Numbers 1 and two both have vacuum advance with two ports, one for advance and one for retard. Numbers 3 and 4 only have one vacuum for advance only.

After searching and searching it seems that number 1 or 2 are preferred in my case. but am not sure as whether to

1 Use the vacuum advance or not for drive ability, is it needed.
if so believe only the advance is used?
2. Do my new carbs have the right vacuum advance port. Reference photo
Both carbs have this plug pointed to by arrow. Is this the advance port? If not where is it or do I have to drill a port Where?

3. If none of my stash are usable then what dizzy is, and please provide the full Bosch or VW part number if possible.

THANKS very much
jjs3rd914

Note the carb port pointed to seems to be above the throttle plate. Just below it on both sides is another threaded plug that is below the throttle plate, but there is no tube protruding to attach a hose.