I have a 73 D200 with a transplanted 440 in it. I rebuilt the motor and have put approx. 500 miles on it over 9 months. The tailpipes have antifreeze droplets coming out of them. It is not burnt, white, or steam. It is droplets like condensation. The headers have antifreeze "boil" on top of the exhaust ports at the head. I have Heddman headers on it. They were on the truck when I got it. To my knowledge, Heddman does not make a header for my truck. Could this be not sealing and coming out of my exhaust from cheap bolts in water jackets and wrong application? Any help. Thank You.