So I tried to start my car yesterday for the first time since I had a cam change with a few other parts like new oil pump, lifters, pushrods, and upgraded valve springs, and 25% underdrive balancer. So When I tried to start it it turned over and was trying to start and would backfire a little and crank for a second then I heard something kinda make a clink noise and my motor locked up so I got a ratchet and turned the motor the opposite way and it rotates fine and when I turn it clockwise it turns until the point where it locks up. I took the valve cover off the driver side and I havent dropped a valve and took the spark plugs out the driver side and the second spark plugs end was tore off so what would cause this to happen?

 

What size cam? Did you check p to v clearance? Are you sure the timing chain was installed properly?