RE: Club FOX!
Typhoon...how much prop are you using on those old .45's? The older vintage "B" frame .40's and .45's were arguably VERY overcarbureted using a carb bore similar to that of the .60 size engines. This, combined with a too-big prop and one could imagine some transition problems arising. Overbore carbs are great if top end is the only objective.
The carb from a current .45/.46 should work well provided it's properly tuned.