I was reading a magazine at a friend's house when we were getting ready to go to a restaurant and saw an article about this thing so I figured I'd post it, it seemed pretty cool-
http://aeromotiveinc.com/2012/11/phantom-fuel-system/
It's basically an in-tank pump setup designed to work with an original vintage style fuel tank which adds a baffle for fuel sloshing, etc. I think it would be good for doing LS swaps?