Unfortunately, not much. Old crossflow, also nicknamed the 2-thirsty-5. Assuming it runs well, maybe worth $400-600. Your best bet is someone needing parts. Try screamandfly.com.
Thanks STV - this thing is thirsty. I have run it out of gas while skiing 3 times in 5 trips....when I rerig the boat I will be getting rid of the tank selection valve and hope it will just draw evenly from both.