We need a new engine on our 1973 Cessna T210L and the prop needs an overhaul/replacement as well. We thought we might as well upgrade while we’re at it. The options I’ve found are: Ram has an upgrade to TSIO-520-M or -R and Hartzell ScimitarPlus prop. Western Skyways has a TN-550F upgrade. Summit Aviation has a 550 T.I. conversion. Texas Skyways has a 310 HP for the Turbo 210 that removes the turbo. Am I missing anyone and does anyone have experience with any of these upgrades?