Carb heat, manifold heat have been around a long time.
Six cylinder engine with intake and exhaust manifolds bolted together(over/under).
1957 283 Intake Manifold heat from the exhaust crossover, it also had two holes drilled so the exhaust could go to the base
As I live in the tropics. I think I'm gonna do the same thing and remove the hoses.
Don't think I need extra heat in my manifold