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The external balance of the last years of the 440 needed both : The correct harmonic balancer AND weighted torque converter. Since you want to retain the older non weighted '68 converter, you have 2 options: You can have the correct weight balance added to your '68 converter OR get the B&M flexplate with the balance offset factored in.
I would have the converter modified. A trans shop can either do it or recommend a source. It can be done for less than $50.

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Use both and you willhave no problems at - been done a kazillion times.