Should I overhaul my car or buy a newer one?

Okay so I am a delivery driver and currently have a 1997 honda accord 4 cylinder auto 2.2 l with 185k on the Chasse. So I have 6 k saved and planned to use this to keep me on the road and delivering. The car at this point is solid. No knocks rust or really any issues at all. Would it be wise to use this money to buy a newer car or use this money to overhaul my current car. Completely rebuild the engine trannny new bolt ons update the suspension the works?

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