Larry Henney,

     Another consideration is the carb heat box itself, the factory two part glass/resin box burns with direct fire on it.  What happens with a flooded intake, "Keep cranking to pull the flames into the engine" is the standard reply, but that might not solve it and how do you know when you have a carb air fire, until it has progressed beyond what you might not like.  An old A&E postulated this problem to me years ago, so we made one of AL mimicking the RV Model which has room for a K&N Filter and a muffed exhaust heat source.  I have have had the inset of carb ice in my MS Carb several times, but with the application of carb heat, never a problem.  Food for thought.. Don Skeele   N320J  a 1987 235/320 painting in progress.