The 1967 250S w108 I just purchased, is sagging a little in the front end. I know nothing about what needs to be done to fix this. Can someone walk me through this? What do I need to look for? I appreciate your help

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1967 Mercedes 250S w/ 350 Chevy V8, stock transmission and rear end.
1968 Mercedes 250S w/ 229 Chevy V6, 350 Turbo Transmission with shift kit, and 1981 Corvette rear end.