This one crops up quite regularly.
IMHO the correct first question is:
How much will it cost to replace the 75 and will that car absolutely, definitely give you the reliability/comfort/economy etc. etc. that you want?
Having got that figure, how much is it going to cost to keep the 75 on the road? Remember that this is probably THE best car forum for knowledge and expertise, willingly given.
Then a "simple" choice of what can you afford, or not, to do.
Good Luck.
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