I hear you on the Ethanol. I am having the same problem on my 73 20SF. Stock tank and hatch. Problem is I did not put the pie holes in when I recored my hatch.

Any chance you could provide some measurements on there location for me? I was planning on doing the same thing. There is no rush, I am working on the other boat right now. I won't hold it against you if the boats are different for some reason. Thanks in advance.