I am working on a 1976 3/4 ton Scottsdale that I bought 10 years ago. The previous owner did a 4wd conversion on it and pretty much screwed up installation of the engine and trans. BTY motor is 454 and it has an auto trans, most likely a 400. I assume these are not the original motor and drivetrain because of the poor installation. Anyway I am trying to piece together factory mounts and have tossed out all the junk he cobbled together. I think I now have the correct front crossmember . See pics. I also thought I had bought the correct engine mounts but the "new" mounts (they are 10 years old) do not fit as the old ones do. The old mounts fit my crossmember and have a staggered 3 bolt pattern. The new mounts are a little longer and have a symmetrical 3 bolt pattern. These mounts are not interchangeable. See pics. The dirty mounts are the ones that fit the crossmember that I have, the new ones do not. So what Have I got going here? It looks like the old mounts put the long mounting bolt in the correct location but the new mounts do as well. The new mounts will not bolt up to the crossmember bolt pattern and are longer as well. What year/model/part number will allow me to bolt up my 454 to the old mounts with the staggered bolt pattern? Many thanks.