These are Fleischmann Lotus 40's , easily the most common of the Fleischmann range, so common that I use them as a source of spare screens, mirrors, roll bars, etc for scratchbuilt jobs!
So don't worry about repainting them or whatever.
They should run smoothly but not ultra fast.
One thing to check is that the Fleishcmann guide is very wide, too wide for the slot on Scalextric track, so it may need thining down a little, or replacing with something else.
Hers is a (bad) picture of the Alfa 33,
You could also finish one in red, as raced by John willment, here's one I did for this years Bordeaux meeting, this is a Strombecker body.