Fr. Frank,
My father's '82 was changed over to a 25" single back in '90 or '91 ('89 225 Evinrude) and the transom was notched 5" to accomodate it. He now has a 25" 225 Yamaha on there. Perhaps a 30" transom was an option back then?
This pic gives you a shot at what his transom looks like.
