Small block to big block TBI

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I have an 87 1/2 ton, 305ci in my 4x4 that is going south and have a 454 big block that I might put in its place. The question? Did the big blocks of that era have the TBI or were they all carburated? Just wondering what I would have to do to put the big block in. I also have an older 350 that I could throw in if its too much of a hassle to go big block with that set-up? I'm sure someone has had this dilema before?