Get yourself a set of push rods from summit and Summit brand they are good and will work for your. Are you sure that you haven't got a little dirt in a lifter. If your lifters are preloading at all they shouldn't be noisy. A lot of racers put the preload at vertualy 0. Borderline clicking. Measure your installed height it could also be a spring that is installed too long without the above mentioned shims. thie will also click and sound like a loose lifter. It takes more than a truing trim milling off a head to require different pushrods and they would be shorter if needed and even with the addition of a thicker head gasket overcompensating for the trim you shouldn't have gained enough thickness to require a longer push rod unless you were borderline to start with.
OEM push rods are 7.514 inches long +/-