The stewart number is on the post...................................
No temp freaks here, just engineering geek types using modern tech devices, wide band A/F meters, IR temp gun, digital readout tach/timing light by snap no, Fluke DVM etc no need for thermocouples...lol No six pak tune up has been too tough to tame yet. Many have been tamed.

What does the guide say? Read it again.

OP you are over- jetted - Center carb jets at 62 or lower.
180 is the wrong thermostat temperature. 195! Pay attention! Stop wasting everyone's time with the 180 operating temp- it will not run properly at that min operating temp- it's in the guide!!!. 195 thermostat - at this pt just buy one from Napa, or look on line for a oem nos 195 temp
the temp change alone to 195 will affect how it runs.............
Float levels
initial timing 16-18 btdc
coolant mix
Firecore spark plug wires
plug gap 0.040
please read the guide