I did approx 40000 miles in a GTV V6 TB. It was 96, P, Black with Half Hide and Air Con. Had 8 x 17 Azevs and 4 pipe Hormann exhaust. I loved it.
They are quite a noisy, rattly engine. They run quite warm too which used to worry me in traffic. They are quite a laggy engine, a Turbo from the old school, the Fiat Coupe 20V Turbo is quicker but the Alfa sounds better and the handling is far superior
Usual GTV faults, check rear suspension doesn't crash, listen for squeaks from front wishbones/ball joints.
I think the V6 TB is good value as it offers virtually 3 litre performance for twin spark money, they are arguably less complex than the 3 litre also. Don't pay too much though as they aren't the easiest cars to sell on and try and buy one with leather.