f head engine design,the dam heater won't keep your gas pedal foot warm if you need it to snow plow. The transmision hump stops the warm air from geting to the right foot. ask me how i know.
Would take old crank bearing halves and jamb them under the hood right outside the windshield to have the engine fan blow on the outside of the windshield.
The one i plowed with had chains on all four wheelswith two extra cross links between the standard cross links.
No real power like today but in its day was the best around