Ok Joe, my thought would be, as long as the dipstick matches the tube, it should work in any of them (or be pretty darn close). You just can't mix and match different dipstick and tubes. Of coarse the correct one is always best, but if you can't find one, you can get by. The diagram leaves a lot to be desired. The measurement we need is from block down to the tip.
The measurement we need is from block down to the tip.
Actually, that measurement is irrelevant (assuming the tube doesn't bottom in the oil pan).
The dimension given in the diagram (from block registration surface to top) is the one that determines the appropriate dipstick. Every single 1964-1990 Olds V8 block has the dipstick tube registration surface in exactly the same place relative to the crank centerline. What you care about is the location of the FULL mark on the dipstick in relation to the block registration surface. Obviously the longer tubes and dipsticks are necessary for BBOs due to the taller deck height. Using an SBO tube on a BBO would likely put the dipstick handle in that notch in the exhaust manifold.
Of course, all that really matters is that when you fill the engine with the five quarts of oil after draining it (and run it for a brief time to fill the new oil filter), you simply scribe a mark on whatever dipstick you have at the level of the oil. You now have a custom-calibrated dipstick.