Tank & Consol Location

[JohnC]

I have no deck in my project so I am starting from scratch as far as the location of the gas tank and the console. I am planning to put the back of a 52 Gal. Moeller tank at about 89" from transom at the deck. That's where the factory notch in the stringer is and the tank fill is at the aft end of the tank. I am also planning a custom console to be about 76" from the same point. I made a drawing for clarification.
Since I don't have the original deck I don't know if I am moving CG forward with this. Does anyone know the original locations? This is a 77 MA 20'.
Thanks, John