Found my dads original 1971 duster!

Not sure I would even want him to attempt to fire up this freshly rebuilt engine. Many things can effect the life of the engine on the initial start up and from some of the postings I'm not sure this dude knows what he's doing. If there ends up being a problem he can just say the engine builder messed up and the engine builder can point fingers back at him. If this engine hasn't been fired I would take it to the builder to do the first start up and break in. Just my thoughts.