T Cut will restore the black a bit i.e. temporarily.. and then you can try fine AAAA grade wire wool or stronger if you want to try and get to see what the blue is like underneath. I note the black paint has been put over the rubbers and everything - I tend to do that sort of thing with a small electrical screwdriver, just picking and releasing against the flexible under surface.
But don't get too set on the black - could be wasted effort titivating its surface - the Opal Blue has to be your goal!
p.s. I note that there is a paper filter in line from the gravity feed tank to what is now a sidedraft carb. Some have said that these impede flow.. so you might be prudent to, when the tank is clean, see if connecting without filter improves running. But you haven't got much head of fuel (the original was a carb several inches further down) so you may also want to ensure a more fullish tank before contemplating running tests.
But don't get too set on the black - could be wasted effort titivating its surface - the Opal Blue has to be your goal!
p.s. I note that there is a paper filter in line from the gravity feed tank to what is now a sidedraft carb. Some have said that these impede flow.. so you might be prudent to, when the tank is clean, see if connecting without filter improves running. But you haven't got much head of fuel (the original was a carb several inches further down) so you may also want to ensure a more fullish tank before contemplating running tests.