Encountered a '73 450SL today for $3500. 155,000 miles. Rough, but very little rust. Interior not too bad. Been sitting for two years. Would not crank for me (in a downpour), but seller says it will but runs rough. Reports tranny to be okay. I walked away (I'm in the midst of another rebuild). However, my experience with 107's is limited, and I have the nagging feeling that I just walked away from a good deal. Any opinions would be hugely appreciated, because if I'm going to change my mind I probably should do it quickly.