My 300d n/a is somewhat slower in acceleration than my 81 rabbit diesel was, although the top speed seem is higher. I don't think you are going to go up any mountains at a reasonable speed with 5 people and gear. it will surely be a climb in third gear, you might have to go down to second.

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andy t
'78 300d
'95 volvo 850, wagon
'86 300sdl - engine out, maybe I'll have it rolling by June

whole bunch o' bicycles