Your engine sounded good. Let me know how it does. Right now I am planning on using mine on nitro fuel. I purchased an ASP .91 carb the other day. I had to make a tube from a piece of aluminum tubing to fit over the carb base and to make it fit into the engine block. It still lacked a little bit to fit tight, and I wrapped a couple of rounds of aluminum tabe around the tube and put silicone sealant around it. I hope this will work. I tried to get an O.S. 7D carb on e-bay last weekend and I was outbid. The os carb would probably have fit without a flange. It just went for more than I wanted to give at this time. We are covered up with snow and it looks like it is going to be quite a while before I can get out to check out anything.