Engine Swap Help Needed: 1964 273 to 2001 5.9 Magnum 360

You can use the LA timing chain cover and water pump, my 98 5.9 magnum is running all LA accessories and ignition (electric fuel pump though). The magnum head is a little different so the alternator bracket won't bolt up perfectly(spacing from head is a little different but holes are the same), but with some spacers and a little tweaking it'll be fine. Unfortunately B&M discontinued the magnum flexplates, as did ATI, so unless you can get lucky and find one (I haven't been able to), you will need to have the converter balance weighted for a magnum (different than LA 360). The stock magnum flexplate, even though it may have the balance weight on it, won't correctly work with the older torque converters. Magnums run a symetrical bolt pattern on the converter, where the LA converters have one bolt slightly off. I've heard of guys widening the hole to make it work (even I did it for a bit), but can't in good conscious recommend doing so.

The magnum engines were mounted in trucks differently than the older la engines, but retain the la mounting points. A magnum 5.9 block has the same mounting lugs as an la 360.

Also, your intake manifold options are a little limited. The magnum intake manifold is bolted to the heads differently, so you'll need one specifically for a magnum. Your choices are the Mopar M1 sp or dp, Edelbrock Airgap (what I'm running), or Professional Products Crosswind (similar to Airgap, but can be used on either a magnum or la engine).

Hope this helped.