Capt'n, you're right on in saying not to forget av8tor - and sure enough he has already joined this thread. Thanks to ALL of you who grace these forums with your advice. Now, I have a few days wait till my engine gets here to ponder all this sage advice. It will be interesting to see how the twin ring compares with the single ring I already have. That one has one of Frank's rings, a muffler from JAG engines, and a larger carb from Peter Faith. It also has not been broken-in yet, so it will be awhile before I can do a comparison with the twin ring. And just to slow things down a bit, my wife of two weeks seems to think I should be spending lots of time with her (don't they understand how much fun all this engine stuff can be?). Thanks again guys.