I could tell the 68 was running hot on the intake on the way home. I moved the wire harness out of harms way but it milted the plastic off the kick down switch. yesterday I checked the heat riser and found it was movable but vary stiff and stuck in a mostly closed position. the spring was off the peg and it had fallen over center to shot most of the gas across the intake. it never would have caused you any trouble around town. the car did not run hot in the water jacket but boy was the carb hot. been better is it was 10 below for running it down the interstate. so when it's cold check those heat risers and make sure there free and hooked up.