360 hydraulic lifter valve lash
I would not change all the lifters
I'd pull out a known good one or buy a new replacment --just one-- and check it and your old ones against the "bad" one and a "known good" one (that's 4 altogether) for pushrod seat height
Check out a couple of other pushrods, although I guess you swapped em
AND CHECK THE valve stem installed height against other valves