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Came off a 1978 F150 custom 351m. mounts on top the intake and goes to carburator and choke. it's the hot air for the choke. it rusted out. 1 tube broke off it by the way. which is why it looks funny
RockAuto has the gasket for your part, but I can't find the heater coil anywhere. A lot of those 2BBL carbs have electric heaters on them and shouldn't be very hard to find and convert. Good luck