I have 2 red stripe Mercs my hands don't allow me to operate them anymore. Mercury 200 runs well needed a fuel pump and comes with it. Good prop and lower unit.
390 is the other one liquid cooled single cyl with reverse rare in that vintage.
I only have one fuel tank so first customer will most likely get that.
The 20hp is $800 and the 3.9 is $200.
local sale for cash and they are available.