TQ makes a lot of sense, low oil pressure could be a root cause of the "noisy lifter" symptom. Also make sure that once you are going in, to notice placement of everything...could have been minor mis-aligned or improperly setup part(s) or improper length rods, etc. as hydralic lifters rely on a bit of "oil pump" up to takeup the clearance you would normally hear as clatter. Also there were some case were areas of the valve covers had to be radius'd if using hi lift cams.
