The original engine mounts are from David Wagner in Detriot MI. He is a dealer for SAI and I belive also from CAV. The 289 driveline is very short. I would have it made after you get the engine and tranny installed. The bottom of the
oil pan should be flush with the bottom of the frame rails. This will require cutting on your scattershield by the starter to clear the frame rail. Also it is important to keep the axis of rotation of the engine and the axis of rotation of the diff parallel. They shold not be perfectly in line.