How much power you are going to be making?? You may need 2 or more.
You will also need a regulator and a return back to the tank if you don't already have one.
I use this one from Mallory for a carb set up with the GSL-392
http://www.summitracing.com/parts/maa-4307m/overview/
and This one for Fuel Injection.
http://www.summitracing.com/parts/maa-4305m