I'm doing an LS swap and need some advice on what engine ecm to use. I have a 2008 gen iv, L76 6.0 from a truck and a 6l90e from a 2012 CTS-V. I have all the engine sensors and DBW TB but not MAF/IAT and O2 sensors. The engine has VVT and AFM which I will delete. The trans code is 1DJA with a julian date of 0243 (end of Aug). The tcm has the numbers 24256124 and under that in smaller text is 612 4 0231Q 0744. I plan on keeping the engine NA and want to run on E85 with a flex fuel sensor. So, an e38 or e67 or something else? Also, new to tuning but not new to engines, electronics and wiring. Thanks everyone!