There is two cut outs in the back bench seat, the battery slides down in that hole and mounts on the board that’s fiberglassed next to the bildge. And the tank holds 20 to 21 gallons. Just filled mine up yesterday.
I have the same boat but with a 1996 Johnson 112 spl with the same prop that you got. At 5400 RPM’s it runs 43 mph by GPS. Great hole shot and no bouncing when I trim it up. I did have to pick the motor up a couple holes on the transom because I was getting a good bit of spray on both sides of...