I ran a few tanks through the TD/Tarno. Been running 25% fuel, Cox grey 5-3 - best number 18,900 rpm. It throttles okay, but it does have a tendency to load up. Might pick up a couple of number drills and open up the air bleed, or just keep the idle high and live with it, a 5-3 at 5k doesn't do much anyway. I have an old Junior falcon airframe that had rudder only escapement, it is stripped down and pretty much ready for recovering, so I think this would be a fine nostalgic combo, especially since it only needs 5-6 hours more work.