Hello everyone, new member here with a 4D55T swapped 93 Ford Ranger. Motor is out of an 87 Ranger with the wastegated turbo. Bought the truck because it was a super clean swap, even retaining heat and a/c. On the way home, it started having some overheating trouble, and now it is feeding exhaust gasses into the cooling system while cranking and will not start. Truck has the head gasket replaced about 3 years ago and I believe this is the head gasket again, if not I have spare heads. What is the best source for a head gasket for one of these motors? And does anyone have a write-up or advice on doing the job? I've owned other diesels, and have performed injection pump replacements on my 6.2/6.5 GM trucks, but I have never dug as far as a head gasket. Any advice would be great. Thanks in advance.