Here are the Forza Editions of the Alfa Romeo 8C and Giulia from Forza Horizon 4. I have tunes available that replicate the specs of the cars from FH4 as well. :
2007 Alfa Romeo 8C Competizione : r/ForzaHorizon
Alfa Romeo 8C Competizione [Forza Edition] by LRF WORKS | Need For Speed Most Wanted | NFSCars
Forza Horizon 4 - 2007 Alfa Romeo 8C Competizione - Customize and Drive - YouTube
2007 Alfa Romeo 8C COMPETIZIONE FORZA EDITION | Forza Horizon 4 | kudosprime.com