Mopar 360LA and 46rh

Hey gang. I’m in the works of swapping out my NP435 to a 46rh on my 360la Powerwagon. Any one have any idea on what flexplate I can use? I know the 360 magnum and LA are balanced differently. Just not to sure on what flexplate I can use. 46rh has a torque converter from a 5.2 magnum. Will a B&M be the way to go? Looking at the B&M 130-10236.