Even with EFI your best bet on intakes is to match them to RPM ranges that are most operated in. therefore, longer runner intakes will still build more torque you just don't need them now for fuel distribution. short runner intakes are better for higher RPM. in todays world of castings being converted, usually intakes that are dual planes have smaller crossectional runners and longer runners so they are more suited to milder engines. larger single planes have both larger cross sections and shorter runner length ideal for higher HP and more RPM.

Plenum volume is a whole other consideration. if you have an engine that has wide rpm swings like a nascar stock car you would prefer a larger volume plenum. an engine like a drag car designed to work in a narrow RPM band can get away with a smaller plenum as most of the time your at WOT anyway.