What model Tillotson carbs are used on the 105? I have a few 105's and a 120powerhead (one 105 runner at the moment), and carbs ranging from WB10A, WB13A, & WB25A, all with 1.560" throat ID, and WB22A2 with a 1.500" throat. Any one out there know the correct carbs? The running engine is a '69...