Panda: I say go for it. I am trying to work out a deal myself on a 1979 450sl. Having an extra around is a gold mine in itself.
The 75 450sl. Is it the D jet or the K jet.
Years ago I once offered a junk yard owner one thousand dollars if I could have a day in his junk. He was tempted but said no.
Strip that puppy down and sell her off.