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When I removed the drain tubes on my 1979 Revenge I found that the gel coat/hull thickness left very tolerance if damaged for installing the replacements. The flaring of the brass ends leaves you with about 1/8th" (maybe 3/16th) to seal and it needs a very tight fit on the gel coat. Second, I do not recall many true 90 angles on the hull for the pre flared tubes to seat 100%. From what you are describing I would recommend pictures and a full analysis of what you have. Run it past the club members. A lot of fellows have made this repair and some with alternative methods. If the holes are compromised you may go something other than original 1" replacement. Possibly sizing up the brass tube diameter and delicately sizing up the original holes. I believe 1-1/4" brass tubes are available. This is a very delicate and important repair. Do study and do not jump into it too quick.