Dosn't look like you over did it on the springs, but I would of taken the inner springs out for breakin if you didn't before, and a good zinc infuzed oil is important or at least a zinc addative,,oil isn't what it used to be,,yes I would personally pull the motor down and do a serious clean-up and just check it over bearings, crank journals, ring's etc., if it is an affordable option, I would consider a hyd or solid roller with good pushrod's and rockers,, having gone thru a myrad if valve train issues myself, I ended up biting the bullet and bought the best I could and so far have not had another issue.