i finally found a site that has info on the 4.3! i have a 81 elco with the 229 and would like to convert to the 4.3. i read the post about people doing this but i have more questions. the main one right now to start is; what year should i purchase and witch vehicle should i look at? i want to run injection most likely throttle body. i have seen the differant oil pans like metal and aluminium. astro, full size p/u, s-10? i know i want a one piece seal but should i buy one with a counter balance shaft? and if i do can i run some performance parts on it? or how about a vortec motor but could i run throttle body injection off an earlier year motor. im pretty mechanily inclined so i perfer injection over carb. sorry for th long post but im excited that there is other people out there that see the potential this motor has. thanks for any help.