That's great- to actually have real Cleveland parts again available after so many 'discontinued' notices!
My personal on-the-road experiments in our Pantera indicate that in stock blocks, the engine water temp does NOT depend on what rating thermostat you run. They all gave virtually the same stabilized water temp after 50 or so road miles. Maybe Mustangs & Galaxies behave differently.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.