Also look at the steering column seal. My knees were getting blasted by hot air from a slot in the steering column tube. A bit of research here told me it was likely a seal at the base of the column (inside the engine compartment) Some duct tape over the slot temporarily/permanently fixed the problem.
I had that going on in my 66. The lower column seal was gone and dang, that drivers side manifold is pretty close. The column near my knee was hot to the touch.