yep the pipe with the plasic bulge thingy is for coolent to stop carb iceing
run it off your bleed line to the header tank should be fine
if i rember it only runs coolent across the bottom of the float bowl to warm it slightly
not sure if carb iceing will be a problem on a roadster but bikes do get it in the cold as the wind chills things down in the winter.
tip if your thinking of upgrading to at injection at any point or dont wish to use an edis unit then look at going down a megasqirt route it can run the ign system and/or inj for almost any engine (handy when you want to fit somthing other than ford with a 36-1 crank trigger)
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