I like what Kamakazi did, however I was refering to the48" section of floor I have from the frount of my console to the step up for the casting deck. Today I got the wiring under the console stripped oout and pulled up the fuel cover. You can see from the pics that there is a bulkhead in front of the tank area with a hole cut into it. This area is empty up to the next bulkhead 16".
My current tank however is only 48" long so I am debating on a longer tank that will hold 55 gal instead of 40 like I have. If I go with the longer one I will move it further foward.

here's a layout of the stringers well in a 78 at least.

http://i8.photobucket.com/albums/a46...t/P1010006.jpg

http://i8.photobucket.com/albums/a46...t/P1010005.jpg

http://i8.photobucket.com/albums/a46...t/P1010004.jpg

http://i8.photobucket.com/albums/a46...t/P1010001.jpg

http://i8.photobucket.com/albums/a46...t/P1010002.jpg

http://i8.photobucket.com/albums/a46...t/P1010003.jpg