Personally I don't care for new boats and carburetors don't bother me so a solid running classic boat with new floor and newer paint would be hard to find for $9,000.
If it doesn't suit what you do you could try and sell it and spend your $6k on a boat that better suits your needs. Otherwise I say keep it, you know what you have and what needs fixing anything short of a new boat (and even some new boats) is going to have surprise costs pop up as well.
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1986 Supra Sunsport Skier with 351W and swivel spotters seat