I bought a '56 Customline 2-dr hardtop in 1978. When I first saw it, I thought it was a Fairlane because someone had stripped off all the Customline body side trim and put on '56 Victoria trim. Someone had put a Ford 390 in it but it was removed by the time I got it. I took it home, dropped a '55, 272 Y-block/Fordomatic in it, added a '56 Fordomatic steering column/linkage, '56 power steering and Fordomatic brake bracket and pedal. I had to completely strip the exterior paint down to bare metal. A previous owner had painted over the factory red/black with cheap white rattle cans. I redid the interior with beautiful white crushed vinyl with blue accents and painted the exterior with white acrylic enamel. I re-installed the Vicky body side trim. It was a good looking car.
Ford only made the Customline 2-dr hardtop in the '56 model year. In 1986, I saw another one in a Bloomington, illinois auto parts swap meet for sale at one of the booths. Mine and that one are the only ones I have ever seen, other than photos of them.