[Bruce in southern OH]

Ralph, could be a potential for carbon monoxide, I agree, I checked the heat ex-changer, inside, it is cast iron like the old steam radiators in homes. I used a big shop vac to blow inside and blocked off the exhaust of heat ex-changer and it did not have any holes I could detect. (large holes). I am sure potential leaks is one reason for change but I did read some where that hot water heat was also available that year.(service manual) This was the last year for the exhaust air heat. I did not even think I would ever install but I am taking the Huntington Christmas Parade Marshal next weekend in parade. He has been very ill and his son said he wanted to ride in an old car, (open car out of question) this is the only car that I could come up with that would protect him from weather and would have GOOD heat. I still will continue to monitor the smells in car for problems or symptoms, it does get hot quick, was 34 degrees here today. Thank you and stay warm, way up North, Merry Christmas