I believe one of the mopar engine books has how to balance a neutral balance flywheel for a 360 LA and a 360 magnum.

That being said, if that is listed there, and is identical to factory, It will work fine. No factory crank/flywheel combination was balanced together...they are all mass produced. You will be fine.

That being said, If you aren't planning on installing a scattershield, I'd certainly prefer a billet SFI flywheel.