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I would check that yoke to see if it has a groove.
Did you get the front of the housing clean and use silicone?



You need to look at the yoke for a groove where the seal rides , and does it have a DUST SHEILD?? There was a REASON the factory installed dust shields on yokes and for some reason the aftermarket deemed them NOT NECESSARY . Also are you sure it's leaking from the SEAL and not getting past the splines and leaking from under the yoke nut/washer?

I agree on the NOS seal thing , rubber does not last forever and I'm pretty sure the original seals on 742's were LEATHER , contact Dr. Diff he has a GOOD 742 seal available .