Got to agree with old300d. I've got a 77 na and an 85TD turbo in Denver. There's no comparison in the mountains. With that load, you'll be crawling in 2nd gear in the Rockies on a steep grade. On the other hand, the turbo will be flying because it's dumber than the NA. It still thinks it's still at about 2000ft while all the other smart cars know they're at 11,000ft.

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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