Thoughts on overhauling an engine. NOTE: the article is about a Lycoming but most, if not all, factors apply equally to TCM engines:

https://generalaviationnews.com/2021/09/05/five-factors-to-consider-before-overhauling-your-engine/?fbclid=IwAR23LSDnkPeIC6I3dhn1MATDbdtm_pKUz6Gv_qsPHTBfwbaKhJ8JwN7-6n0