The Negative Side of Using An 180 Degree Thermostat?

What harm would I be doing to my 440 SP if I used 180 degree thermostat over a 195? It doesn't overheat and stays right on 195, but starts to act "Funky" at operating temp. Meaning, like most 440 SP the crap they call premium gas goes to vapor. Can cooler be doable for these engines?

BTW - I run this ride in very thin air!
Author: wedg2go