Grinding, " diesel " noise under valve covers

hold up. your fuel pump arm has 1/4 lateral movement..side to side? F that pump! it should have no side to side movement and of the cam cog is lobsided(loose) it will have possibly caused that movement. Try and start motor with no fuel pump. should idle for 20+ seconds on a full bowl, enough to listen for grinding noise without your fuel pump (maybe making it!)