Anyone have any experience towing heavy loads with a zz4 motor? I have one in my 71 chev 355hp 405 lb ft. Seems with the right trans like a 4l80 behind it and a lower rear end gear ratio it would make a light, trail/tow rig motor? just trying to decide whether to put my money into injecting it and trans / gear ratio swaps or go duramax swap. Anyone know of a harness for a duramax yet? from my searches I havent found any but new stuff is always popping up.