A temp gauge would be a very good idea. Even if only to leave it on until you're sure everything is working properly. I believe(not possitive) that 67s came from the factory with a heat sheild that went between the int man and the carb to help reflect some of the heat. The first thing I would do is throw that glass fuel filter in the garbage before the fire happens and then get the proper heat sheild for the carb(if qjet). With the fuel at the boiling point like that vapor lock will be your nemesis. You really shouldn't be running that hot. You need to find out how hot you're getting and go from there.