My 74 Olds Custom Cruiser had been sitting for over a year. Just put the jumpers on it and fired it up. Was a little concerned about the old fuel but I sold it to a guy who just drove it home figuring he'd fill up the tank with new gas and hope for the best. He never called me back and I know he registered it.
Go for it.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13