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What brand is the compressor? It is wise to use Ford original, or another NEW compressor. If you must use a rebuilt, you want to make sure that it isn't one of the cheap ones that are barely remanufactured.
I would replace the accum. too. If cost isn't an issue I would replace any lines that look suspect. Otherwise, it should be fine so long as it holds vacuum. Make sure all r-12 is evacuated as the 2 refr. don't mix well. Maybe a good flush.
Make sure to use POE or Ester oil, if you are going to recharge with R-134a, unless you flush out the entire system. Even still, from what I have read, POE is better than the standard factory fill PAG for keeping away moisture in the system (which is what kills it).