I helped Tim W. build a '68 Valiant into a very mean road racer. It would go 160 mph on the front straight at Portland International. Would also hit 160 mph on the local freeway if you were brave enough. Suspension was still a stock design although every part got modified to some extent. It takes a lot of work to build one of these cars. Definitely cheaper and easier to just buy a used Z51 but if you need a project to keep you busy it is a good one.