Currently running a Alfa GTV6 ( same chassis with coupe body and 2.5 motor ) in ITS and a Milano Verde in ITE ( an old IMSA IS car, way to modified to revert back to ITS ).
There were only 900 Verdes brought into the US, but the Milano was a good seller. THe V6 motors do not have any interchangeability with the 4 cylinders - these cars do not blow head gaskets.
The stock Verde was rev limited to 5800 for warranty purposes. In modified form 7400-7800 in reasonable. The 3.0 is a great motor with a fat torque curve. With basic IT mods 220 at the crank is reasonable.

Torsion bars are avaiable but not in the USA. The rear brakes do get hot, but it is not really that hard to duct some air. We run the GTV6 at TWS for 6 hours and at that time the brakes are only half worn. The rear brakes are not as much of an issue as you think.

I have toyed with building a Verde, but have not yet found the right car.

The ITE Verde in IMSA trim, blows by everyone down the straights. The Alfa 3.0 motor is very strong. If only they would let us run the 3.0 GTV6.

ANDREWG