Inliners International Forums General Discussion Engines Intake heat - exhaust or water?

I have a 1954 261--am going with dual Carter/Weber carbs on this newly rebuilt engine. Have gotten some conflicting advice about heating the intake manifold. May still get conflicting opinions here, but what is the general consensus? Exhaust heat or water heat? Living in the Colorado foothills--it does get brisk.

Thanks for info,
T.K.