You need to clean the cylinder head
Valve Spring seat area, lubricate the valve guide and valve stem oil seal with clean engine oil and install the valves into the proper port, the valve stem oil seal, the valve spring, and the valve spring cap, compress the valve spring using the J 38606 and install the valve keys. Then you can remove the J 22794 from the spark plug port, hand start the spark plug, install the spark plug wires at the ignition coil and the spark plug wire to the spark plug, inspect the wires and install the rocker's arm.