Alex Jupe has a good hand with these cars. His 3.5L project wiht 260 Hp had just a test drive in Auto Italia magazine, with flying colours. Also in the same test there was a 3.5L 75 with 310hp with TBīs. Nice reading! Here the link to the Jupe car, how it was made.
Alex Jupe Motorsport :: Alfa Romeo GTV6 / 75 servicing, upgrades, sales & track preparation
Some of the photos: in a way (bumper)less is more. Also the mirrors are replaced. But what makes this car great are the much more potent engine and the RSR handling kit.