New Owner Questions

[Jon2002]

I am the new owner of a 1978 23' Sceptre in OC Md. It has a Volvo 290 I/O 350 cid @ 260hp. Had twin 3.0l Volvos replaced by single in 1988. I have a couple of questions I hope you all can help with. What is the fuel tank capacity? Went offshore yesterday (released a small blue marlin!) and the guage was on E when we got back and took 54 gal to fill. Previous owner said he thinks it is 70 gal. Boat is all original except for engine change. Was garage kept. Is this a "Potter" boat and what does that mean? I have some wear on the outdrive and would like to know if there is a good website for info on this 1988 Volvo 290. I also need a new voltmeter. I will try to post some pics soon....thanks