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No, it will not.
The 98 had a longer wheelbase than a Starfire or 88. Therefore a longer driveshaft.
The Olds parts book shows that 63 & 64 98 models use the same driveshaft #386022.
Bummer, I'm doing a th 400 swap on my 64. I bought the conversion package of a gentleman that had it on a 62 stafire and I was hoping the driveshaft would work lol