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How about using a 383 forged crank? Same stroke. Just smaller thrust bearing surface.

what I have is a newly acquirered car with a '71 383 cast crank engine. it has a mech. vibration at about 2000rpm, and it has a int. steel crank balancer on it now. I want to put a proper ext. balance balancer on it and see if it goes away.I do not have a spare balancer with the correct pt# for a '72 383, but I do have a couple of 400/440 cast crank one's and was wondering if ANY cast crank balancer should be correct?