I have to put in my vote for Lycon. Several years ago Steve expedited a rebuild of a rare Lycoming O-340, no longer supported by Lycoming, This allowed me to get flying, four months, after my accident on the truck bed. He worked with me to get a non stock induction system, required to fit in the 235 cowl, to have a balanced mixture distribution. When that didn't work out in the flight testing program they built up a special fuel injection system that has worked great. I'll agree with others about having limited success leaving messages, The important thing is that they do know their engines and stand behind them. Rusty