Car died while driving, ignition help!

Check supply voltage to the MSD box, get the sheet (destructions) and go through it

You using a Mopar style dist? Check the reluctor gap, inspect the reluctor/ pickup for damage, and "work" the connector in/ out to scrub the terminals clean.

Put your voltmeter on low AC volts in the disconnected dist. connector and crank the engine. The pickup coil should generate about 1 volt AC

"New" does not mean "functionally good."