I have it ! The exhaust below the hood of number 1 is a gas tank heater that works in conjunction with the gas line trap for winter operation.
By looking at how bloated the carb to air cleaner hose is, you may be right.
Or, he used a radiator hose off a '68 Buick.
Personally, I think #1 belongs to a Nascar pit crew member, used for practice during the "off" season. (Note the air gun ready, gas cap already removed.)