I have 1974 Barth on a 1 ton chevy van frame. I am looking for 2 very good doors for the van drivers and passager

Is that a chevy 3500 van?

No its a C30

On THIS site: http://www.autopartsfair.com/u...1500-door_leads.html

they list a Chevrolet C30 panel but only in
the years of 1960 to 1966 = both sides

and listed a Chevrolet G30Van but only in
the years 1970 to 1997 = both sides

...> http://www.automotix.net/bodyp...0_van-inventory.html