I know it's a fake because the frame doesn't have a single tube or lug in common with a real Colnago from that era.
No Campy parts, no clovers anywhere, no campy rear dropouts,...
And still a bike shop here in belgium was able to sell it as a "Colnago" to it's previous owner.

I have been searching for some months now but i'm still not able to identify the frame.
It has a funny "C" with a heart stamped in de seatstays, a cut out bottom bracket and windowd lugs.
I'll post some pictures when i can find them