I can tell you from experience that a big block center sump car oil pan doesn't work well with a 4x4. I put a 70 400 into a 70s 1/2 ton that had a dis functioning 4x4 setup, but retained the front axle (a broke teenager that needed a truck, bought the 4x4 without a drive train and had a 400 & 727 sitting). After the install, I slid into a ditch in a snow storm, the front axle smashed the oil pan and bent the pickup tube. Gene