[MARKDTN]

There are many 67-72 4x4s that have put in a big block since it was not available from GM. The late 90s 454s have the same mounts as an early one so it can bolt in pretty easy. There are typical big-block issues with exhaust, cooling, and such. Yours is a bit of a hybrid as you are also adding fuel injection and an electronic trans. so wiring, speedo, and fuel tank enter in as well. You will I'm sure have to build all new driveshafts. Not sure if the output location on the new transfer case is compatible with the early axle-might be on opposite sides?