Well first off growing up with a Dad that restored two National First 1930 Model A Fords in my life I have a very good understanding what it takes to restore a antique car. But that being said ordering parts that were made to bolt together is much easier than taking parts from a Caprice and bolting them to a 60s vintage truck.
Doing a project like your talking takes some real talent. Anybody can bolt stock parts together thats easy...
