I use a 160* t-stat also. the motor actually stays in the neighborhood of 180*, on a hot day alittle higher.
This car runs hot it came with a 6 1/4" pulley part # 9788886 XT but I cannot find this pulley anywhere so I went with an 8".
Then it started to boil over so I chucked the bent pulley up on my bench grinder and bent it back with a deadblow hammer.
it is still a little bent but a lot better than it was.
I don't think I will be able to find this pulley and nobody remakes it and I have a couple parts guys trying to source one.
I do know a local guy with a CNC machine so I may just take in the 8" and tell him to make me one the same only 6 1/4" diam.
I am going to take it down the mountain for an alignment this week and see what the temp does running it up the mountain.
It has a new radiator so if it boils over the next step I guess is a high volume pump and a 180 stat.
So far it is working but the temp outside was 38 when I tested it, it will be a different story in the summer when temps hit triple digits.
The radiator has a shroud and the fan is a little less than an inch from the radiator.