Best way to rewire for an MSD?

^^Yup^^ Very common if not THE common mistake

Here's how and why

The blue "run" wire IGN1 is ONLY hot with the key in 'run.' It goes DEAD when cranking

The (usually) brown IGN2 is the coil ballast bypass circuit. It is hot in cranking and is the ONLY source of power for the ignition

When you use an ignition that does not use a ballast, you must jumper the two together