I’ve had a look at the Tecumseh workshop manual and although it’s got several illustrations for for what they refer to as small and medium frame engines ( less than 8hp) , nothing specifically for a V60 and only for Tillotson and Tecumseh carbs. Perhaps Dellorto carbs were a later fitment ? When you ordered the components from the US, what was your source of information for specifying them and are you able to post the illustrations that you used ? Also it would be helpful if you can post images of your carburettor and linkage set up.
Edit. Just read one of your original posts and see that you are at Dymchurch – I’m at Appledore, so a viewing could be a possibility !