If you do get the engine to run near 160 make sure you change the oil a little more often because the temp isn't high enough to get the condensation out of the crankcase via the PCV. There is a reason for the factory putting higher rated stats in.
I agree AND make sure you TUNE the engine when it;s up to operating temp. When they run cool like that, it's important to retune them for it. Most will take some more timing and can be fattened up at the carburetor a little.
