I also had a '67 D100. That was my first vehicle, 16 years old. It was poly 318, three on the tree. Drum brakes all the way around, single system brakes, solid front axle. Talk about rough riding! It was a short bed, utiline. Love the looks, and the uniqueness of the three on the tree, but it started giving me trouble (getting stuck in third) and I had to convert it to floor. Double footed braking was necessary at times, and the floors were gone, and I think it must have had 4.10 gears. I could have made it more livable by converting front end and upgrading the brake system, but those two alone would cost thousands of dollars. Again, this is why the '72 thru '80 are the perfect trucks to me. Still get the cool square body, metal grilles and other parts that should be metal. Just have to find them without rust along drip rail and wheel wells, along with the other places you find in all old cars and trucks. Go West my friend, go West, haha.