Magnum 5.2 timing

You can treat this like any other decent engine, not 5.2 Magnum specific. Around 34-36 degrees mechanical at about 2500 rpm, and about 10 degrees initial.
Use a vacuum advance for best street mileage.
If using a swapped in factory LA distributor you use FBO limiter plate to get the mechanical limits you want.
How to limit mechanical advance in a mopar distributor, tuning for street, strip or all out racing, cure that rich stinky idle, win races