sobayshortbed

I have an LY6 with a 6L90E trans, i have the stock harness and i do not have an ecu. Im looking for the most cost effective way to get it running. should i stick with the stock harness and get it reworked and buy an ecu and have it tuned or buy an already tuned ecu? Also what would be a nice cam for that engine, i will be putting long tube headers on it and stick with the truck intake for now. Thanks