Had a handful of conti's with bad geometry come through this year. One of them a 150 hour top with slap worn out rockers and another made it to 400. You can physically see it side loading when it's not right.
My airport partner had that conversion in his 185 on amphibs. Lot's of power however........ it was very nose heavy, unstable and very thirsty. Also when taking off using the manually controlled turbo...the turbo wouldn't come up to speed until the plane was up to take off speed. We altered the turbo control to be automatic which automatically got the turbo up to speed prior to pushing the throttle. Even if that STC is still available and you can have someone give you an engine for free I do not recommend anyone use it. Last I checked, that engine was over $100g.
I think Turbo Tech also had a naturally aspirated 0-540 conversion, but I never saw one.