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Hi,
There were different part numbers which had different overall functionality so one may have more logic gates or flip flops then another. You had to get a part number that had enough flip flops and gates to do the job you needed. But the parts were always the same not custom. They were only custom after being programmed, just like a PROM. So it was never a matter of making an entire custom IC chip.
It's been so long now though i hardly remember any details.