There are at least two different lengths of stovebolt pushrods, depending on the style of lifter used. The "milk can" lifter uses a shorter pushrod than the later style, more conventional looking type, and there's also a 1/8" difference in the height of a 216 and a 235 engine block. I'm not sure if 216 and 235 engines run different length pushrods. I'd suggest starting over by measuring the pushrods. Did you ever figure out if you're working with hydraulic lifters or solids? The adjustment procedure is totally different, although the companion cylinder procedure can be used for both types. Have you considered that the cam lobe under the pushrod on that cylinder with the oddball adjuster height might be worn out?
Jerry

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