A lot of NOS parts are junk after 50 years of sitting in a warehouse. I've thrown away tons of NOS parts over the past 10 years because the steel was covered in rust or the gaskets had turned to powder or the rubber had become hard as rock. Inspect everything, if you think the parts will work then use them. If the parts are junk then toss them. One thing you can do with NOS parts is to use them to confirm that aftermarket parts are built correctly. A lot of aftermarket parts are junk too but for a different reason. Aftermarket parts, especially stuff built offshore, is often built to the wrong dimensions.