340 issue after camshaft change

You don't let a fresh build idle on initial start. It needs to run between 2500-4000 varying to get good oil splash to the camshaft for about 15 solid minutes. Letting one idle on initial start is a sure fire way to wipe a lobe on the camshaft, resulting in having to tear the engine down, clean all of the metal out, possibly replace ruined engine bearings and do it all again.