Also - the Tower 46 is a powerful engine, albeit many people have trouble tuning theirs. Mine took a whole summer of running rich before it really loosened up and started acting like it should - it seems that it takes a lot more break-in than my other ABC engines have.

I also had an airleak around the base of the carb , and possibly at the backplate. I RTV'ed everything I could, and locktited the threads when I put it back together.