Is it a good idea or a bad one to put a little anti-sieze on the secondary well threads before screwing it in. Will it help later in possible future repairs or rebuilds?
It wouldn't do any good as carb Jets, and secondary Well, are Submersed in Gasoline. I use 4 oz of Marvel Mystery Oil to 10 Gallons of Gasoline each fill-up. Maybe the MMO would lube the secondary well as it flows through and around it.
Anti-Seize I only use for bolts and nuts that stay Dry, (if they can), to prevent locking up and rusting.