FINALLY found a 454 to put in my 89 Burb. Complete motor, all brackets, accessories, and wiring from an 89 1 ton. I need a little help identifying the block. Here is what I found for a block number 1401544: 1401544, 1975-87, 454 truck So, what type of block is this? Mark IV? Also, does anyone have the vacume diagram for an 89? The yard cut a couple of the lines and unbolted the accessories. Been researching this swap for a LONG time. I think I will take lots of pics and post a writeup about it. Thanks for any assitance.