It’s a problem to be solved, not a concourse 100 pt restoration. Buy or make adaptors.
You are putting a 408 stroked 360 Magnum in a ‘66 along with an OD trans plus hood and trunk hinges that are gas struts instead of the factory torsion rods that you adapted from a Mitsubishi. This isn’t about what was factory.
Why are you sweating this? Build or buy some freaking adaptors and get on with it! :poke: