Which Thermostat?

In a '71 I would use a 180° thermostat rather than a 195° to control percolation and other fuel-related hassles with today's reformulated gasoline. I would definitely not use a 160° unit, and if fuel headaches weren't an issue (consistently cold ambient temperatures, for example) I'd use a 195°. See recent previous thread here.

(The difference between a 180° and a 195°*thermostat is not enough to adversely affect anything plastic or rubber under the hood that is starting out in good shape, and you're certainly not going to crack a manifold by using a 195°*thermostat.)