i don't know about 4x4's or 87 models but on the 63 to 66 you cant just move the 250/ v8 perch foward, the crosmember mounting hole is in the wrong location and it will be at the wrong angle it you try it. the upper bossed on the 292 block are recessed and you can use the 250 motor bracket but will require the spacers to set it at right angle. i know the later model ones are different all round but since the blocks are the same i believe. it may or may not work. mabey the standardized them for later models. glad to see you went with the 292. ever kick around the idea of a smaller 4 barrel carb? hr