904 and 8 3/4" gasket advice

Chained_360 said

Well, I certainly do hope it's just the seal. In the event it's not, is that something that can be patched together with JB-weld or something similar for a short time? The car will be getting a 4-speed conversion in the near future and I don't want to buy a new converter if it's going to come out again anyways.

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Nope, if it's the converter hub that's fubared, you can also bet that the pump bushing is thrashed too. While changing the seal, (if the hub looks good) also change the front pump gasket and the front pump o-ring. If the transmission is the original one, and has never been repaired, keep in mind that all those items are over 40 years old.
If the hub is damaged, there is no quick fix. I don't understand the use of speedy sleeves(except gypo car lots and questionable transmission people). The hub of the converter must be like a crank journal. Smooth as a babys' butt and so must the pump bushing.
Keep in mind that driving from Seattle to Indy involves mountain passes. First through the Cascade range starting just East of Seattle, and then you have to contend with the Rocky Mountains. Not my idea of having a trouble free drive with a cheapo fix. JMHO