When I last built my econoline(1992) I was more concerned about driveability. I was living in the mountains and using it for a work truck. lots of fast mountain roads. I lowered the whole drivetrain ( 302 and c-6) 3 inches. This really helped the center of gravity, made the old truck go around corners good. The headers are so low that I have overloaded the truck and it was dragging the headers. When overloaded it would lower the whole truck evenly on all 4 corners, and the front tires would touch in a tight turn.