i got a 85 2wd short bed last week. http://coloradok5.com/forums/showthread.php?t=296680 found a 03 5.3/4l60e combo from a 2wd just a bit under 100k miles. has comp and harnness and all parts needed to swap. figure 2k to my door is good deal for all of it. i know i will need to swap in tbi tank and swap in diffrent pump to make up pressure diffrence. also add return line to tank. what all is required in harnness mods to run plug n play basics. ? anyone know of oil pan clearence on 2wd problems ? i dont need cat's for my use and also egr if it makes a diffrence on fuel mileage i will leave it on . mabye a simple cam swap and diffrent intake for more flow/power if there is cheep simple mods . non a/c truck so no need for a/c comp in the way on lower pass side . basic set of adaptor motor mounts required yes . thanks for the help and i will start reading up on the swaps other have done. just read y5mgisi short version thread good info there.