correct me if Im wrong the torsion bar is just a different style "Spring" right, and as I remember torsion bar suspensions are only adequate for pickup trucks and not for road racing and euro cars dumped them only a few years after 1st using them.
Where did you get that idea? Many cars over the years have used torsion bar suspension. There is nothing intrinsically different, the spring is just packaged in a different shape. The main drawback is routing headers. They have a lot of advantages as a suspension system -- the geometry is superior to the typical mid-60s pony car setup, and the spring load is transferred to the unibody at its strongest point below the firewall, rather than through the front inner fenders and subframe.
