340 build question

Just got my short block back from the shop. Long story short it's a 73 cast crank 340. I had the shop balance the new pistons/rod assemblies and original crank.
My question is, do I still need to use the original harmonic (cast crank)balancer and a torque converter for the cast crank set up, or can I use a fluid dampner and a converter from a forged crank trans set-up? I have most of these items on hand, just curious. Thanks for any input.