hey guys, im a 19 year old guy and i got a 1993 gmc sierra stepside. i love the truck too death its got a rockin 5.7 350 but unfortinately its just about at the end of its life and i wanna put a diesel engine in but i got a couple questions, what should i go for, a 6.2, 6.5 or a 6.6 so far im thinkin bout goin with the 6.6 with a 6 speed allison transmission but im not sure if ill have enough room in the engine bay, and theres all the normal issues of changing over, anybody got any ideas? i use it as a daily driver but am prolly gonna put a 6inch suspension lift on it in the fall and im getting the transfer case rebuilt too. anybody got any ideas?