If I understand correctly this is what I used on my LS1 motor. It is a factory corvette fuel filter that has a return built into it. Also I am adding the quick connect connectors I used. Kinda on the high side but this is the way to go for me. Hope it helps.
WIX filter #33737
3/8 russell quick connect # 640850
5/16 russell quick connect # 640860
Russell 3/8 Male quick connect to -6AN 640940
EDIT: For no return this is the filter for a factory truck. These do not have the slip on fittings.
Purolator Fuel Filter
Part No. F33144
Fram In-Line Fuel Filter
Part No. G3727
ACDelco Fuel Filter
Part No. GF652