Personaly I think it would be a better set-up between the carb and intake. simply for mounting
it easier.But with that intake pretty much being a side draft set-up,I'm not to sure how well adding any kinda heat to it would work to start with.With out welding anything to the intake,The spacer type water heat i think would be about your
best bet.If i had a carb gasket I'm sure i could make something out of a block of billet 6061 alum.