Just assemble it and run it. Chrysler balancing limits were so much larger than the Ford or GM limits because the engineers were saving a buck on something that didn't matter. If the public never complained about Mopar engine running rough, they were balanced well enough.
It's been done since the cast crank era began, the rods and pistons are close enough, the counterweights are for the different density of the cast iron and steel. So match the flywheel/converter/balancer with the crankshaft and run the sonofabuck.

R.