Lol, an unconscious fuckwit I'd guess
D springs nah they're made from paper clips by comparison. You got to remember these bad boys have to support not only the tractor style frame but also that hulking great cast iron V8 sitting up front. I've read that an undressed AMC 360 weighs over 600Lbs!
Spent my night wire brushing/de-greasing the wheel wells, now I'm cold itchy and p'eed off!