cam going away- its a solid roller would it go away?

springs not set up right- the guy who built it built race motors for a living,(I can't ask him he moved away) and had a good name but I guess I should check it out. what would be the best way to know if that is a problem?

valves are bad- stainless valves and seats would they go bad after only 15000miles?
thanks
jason
I'm not sure about the fuel timing being off. holly 750