69 k20 axle/motor swap

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The front end will bolt right in no issues there. The rear end will bolt in as well, 1 ton 73-87 chevys have the same spring perch width in the rear as all the 67-72s do. You will however have to change the mounts for the rear shocks i believe, i think 67-72s are both on the same side of the axle tube and 73-87s have on shock on each side (one side in front of the axle tube, one on the back side) As for the motor, I have no first hand experience with putting big blocks in 67-72 4x4s but from what I've seen on here you need to move the motor forward from the small block location to have firewall clearance. As for wiring up the TBI setup, there are many sites online if you search that have the wiring diagrams, a friend of mine did it to a '73 that he put a tbi small block in you end up with a constant 12v hot lead, an ignition keyed 12v source, and a ground. Hope this helps.