I am going to put a sump in my tank. I do n ot have access to the car right now so I can not punt the tank in to find out were the best place for a sump is. Can anybody help me what a good location is mesurement wise?

Car is a 70 chevelle converetable .

In the center from left to right and as far rearward as possible.
Just like this...
http://www.chevelles.com/forums/attachment.php?attachmentid=1635&d=1137894219