I don’t have much for tips, just a couple things for people interested. I’ve always used Motorcraft rebuild kits in the past, you could still get them from Ford not that many years ago, but I haven’t checked in quite a while. A friendly Ford dealer parts department might be able to check on their locator service for any kits out there still if they’ve gone obsolete. Towards the late years Ford consolidated many of the previous kit numbers to just one or two, the C2SZ-9A5586-D was one I used a few times. The Motorcraft rebuild kit doesn’t include the vacuum secondary diaphragm, I found I could get those through NAPA in the Echlin line. It seems I remember it took a NAPA counter person who could use an actual paper catalog to find the part number, and they had to special order them for me, but they were available. The secondary diagram is NAPA Echlin part # 2-4241. The newer secondary diaphragms come with the plastic arm, so for originality if yours has the metal arm be sure not to lose that. It’s possible the full NAPA rebuild kit, if still available, was made by the same manufacturer as the Motorcraft kit, but I don’t know that. Years ago Ford had quite a few jets sizes available, a couple years ago another member was looking for the part numbers and I posted that from the Ford Parts book, I’ll try to find that picture again. There is a company reproducing the Ford Jets, they are available on the Internet and some of the bigger carb parts companies. A common trick for people racing a 4100 is to use a Holley power valve, which has more calibrations available. The primary & secondary booster assemblies usually have a code stamped on them that match a particular carb, the codes can be looked up in the Ford Parts books, if you want us to double check you still have the originals.
Here’s an alternate replacement secondary diagram, I don’t remember where I sourced these Hygrade ones.
Jet info from Ford Parts book