I think Aeromotive has got a very powerful in tank pump. I know that the Walbros or the 023 they should deliver about 255lph but if you're not satisfied with that delivery then you can fit 2 Walbros or similar in tank pumps, if you dont want to modify the tank. I fitted my self 2 in tank fuel pumps in parallel to each other and they are working fine. Skylines they use this type of conversion, at lease if you have a fuel pump failling you'll have a good amount of fuel delivery to system.