Ls 1 swap fuel tank question

[harp]

my 55 shortbed came with an Ls 1 but the fuel tank was from 55 car? and thrown between frame behind axle. the fuel slosh prevented the truck from launching or running good on less then half a tank. the fuel pickup was on the lower front of the old tank. ive designed a new low profile tank in the same location with baffles and a sump. my question is: the tank builder wants to move the pickup to the top over the sump insert a fitting with a suction tube into the sump. will the inline fuel pump do alright with this type of suction line versus the direct gravity feed style of having the port low and forward in the sump? any comments and help would be greatly appreciated.