You’re a pilot, so you’ve said it at least once about every airplane you’ve owned: “It’s a great airplane, but it just needs a little more power.”
It’s different this time. You’re serious. You’ve had the flying machine for a few years and you’ve gotten the avionics where you want them, the airframe and systems are sound, but you want more performance. The climb rate on hot days leaves a lot to be desired, especially when you bump the speed up enough to keep the cylinder head temps below 400 degrees. Plus, and this is the big plus, it’s really and truly time for an engine overhaul.