I am doing a 4" crankshaft 360 deal right now..................Molnar crank and rods , Weisco pistons , had it internally balanced and it was a piece of cake.
Took weight out , no Mallory required.
Neutral balance ATI damper and MoPar performance flex plate.
I did not do it on this deal , but my last , I had the damper built with the G.M. / Chevrolet pattern on the front which opens up your options for crank trigger and pulley / drive mandrel selection.
The number of choices this opens up is VAST , and significantly cheaper.