There are several differences in setting up a drive by wire throttle body for an LS engine compared to a drive by cable throttle body. Al goes through the differences and what you need to know for your LS engine swap.
Drive by Cable Fuel Injection Systems: http://www.summitracing.com/oh/search/part-type/fuel-injection-systems/make/chevrolet/engine-family/chevy-small-block-gen-iii-iv-ls-based-engines
Drive by Wire Wiring Harness: http://www.summitracing.com/parts/nal-19166568/overview/
Drive by Cable Wiring Harness: http://www.summitracing.com/search/department/ignitions-electrical/make/chevrolet/engine-family/chevy-small-block-gen-iii-iv-ls-based-engines/section/electrical-wiring/part-type/wiring-harnesses