New rebuild....but tic..tic...tic

Just take the rockers off and lay a straight edge across the valve tips. If it is out that far, it will be obvious and measureable.

Just keep in mind that if a lifter is weak/not holding oil, that may be the cause the large gap you had on 6E. With that lifter on the base circle, where you measured the lash, push down on the pushrod side of the rocker. If it is squishy, then the lifter has lost oil.