Checked out the rig set up this weekend and yes it looks wrong, the mast is blocked forward in the partners and the butt is two and a half inches behind the vertical step in the cabin sole in the head. I looked at the butt of the mast and couldn't figure out how to move it forward. My hull number is 126 and year is 1979 I think.
I am most grateful for your comments and help. I am in a bit of a vacuum here in Grand Cayman as I'm only one of two J30's on the island.