I'm currently running a 1989 Evinrude 150 on my Crestliner. It runs great after I paid a local marina to tune it up for me.
It ran rough at slow speed when I bought the boat, and ran good at higher speeds. I took a chance and I'm glad I did. The motor had its VRO disabled and removed by a previous owner, and I left it that way. Compression was good on all 6 cylinders.
The shop replaced the water pump/impeller, diagnosed and fixed a low fuel pressure issue and replaced a main gasket at or near the bottom of the power head. They did some other work on the boat and motor and it runs like it has another 10 years left in it, maybe longer. It was well worth the $900 it cost for the repair work.
I know it's not a Ficht motor, but there are some good older motors that still run great with some initial investment.