You want the thermostat not so much to prevent overheating, but to prevent underheating! Thermostat promotes quicker warm up such that you have less ring to wall wear.....the 192 temp is sort of an ideal number in the metallurgy world of auto engines........FOrd made it their defacto standard in mid 70's.....up thru the 90's in the new modular motors.....
I used the same principle of the spacer, two gaskets, and slightly longer bolts. Worked FANTASTIC!!!! Car warmed up right away, was great when you really needed the heater!!! (Remember, we drove our car all seasons...floods allowing...and Christmas dinners!!!)
Why did DeT not do it??????? Good question. Perhaps it meant one more machining operation to accommodate an "unneeded" part....... Maybe all alloy Italian engines didn't need the regulation like 'Merican cast iron hunks.....!
Your car will run better with one in it! Remember, even an evening blast in the cool summer evening could cool your engine too much!!! Carb performance could suffer.....mixture gets wadded up.....