I don't know of any Tilotson sites, but if you get the book
"The Model A Ford Carburator" available at most Model A parts houses, it'll have a section on them. It costs about 6.00 and well worth the money.
Speaking of Tillotson carbs, My father-in-law owns a 1930 A and needs to know the specs on the float highth setpoint. I am going to purchase the aformentioned manual as a gift but I was wondering if anyone might know it off hand. Thanks !!!