Well, you didn't say anything about r134 conversion, but you may want to hit Rollguy's thread about the Sanden conversion kit he's making to use a newer compressor to get you cool. You may still need to address some of the vacuum pods, just to keep your tranny happy. And the more you do yourself, the more tools you'll need.

Edit: Rollguy got here before me..

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1985 300D-189k The 'UD', Ivory and Pinkamino
1979 300D-211k Dark Gray, Parchment
A 1980 Harley-~166k and
A 1994 Ford diesel pickup-349k and
A 1990 gasser Volvo wagon-145k