The Walbro pickups require suction to work. There are no provisions on Walbro pumps for this, nor are there anyin the standard tank for pickpup attachment.
Since you already have a tank, as Dave mentions above there is kit available to convert your current tank. See here
http://www.vaporworx.com/retroworx_kit.htm
5th-gen pumps can be had on camaro5.com with an OE fuel level sensor for well under $100 shipped with very low mileage. Those guys are putting in the ZL1 pump for big power/supercharging so they don't need their original any longer.
For your power level skip the corner pickups to make your life easier and less expensive.