It would not be appropriate to remove the elbow. I think the elbow was only done on some of the early cars and those were all ZF-1. In the past I had a 71 (not Pushbutton) that had a ZF-1 as well but it did not have the dipstick. I think the dip stick slightly overfills the ZF-1. As Larry, Simon, and others suggest, it is best to simply fill to the bottom of the side plug.
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