Hi Gilbert,

To confirm whether you have a flat camshaft or a dished camshaft, inspect the cam gear.  If the motor is still together, you will need to remove the oil pump.  Once you can see the end of the camshaft, a flat cam will have three rivets or bolts holding the cam gear to the camshaft.  The dished camshaft will have four rivets holding the cam gear to the camshaft.

Thanks, Andy