If it's accessible enough to get JB weld on it couldn't you get someone to weld it? Is the hole in the pan or the housing? Aluminum or steel?
The stock clutch will get you pretty far, for mild builds a new OEM (not OEM spec generic crap though) will hold up fine. If you want to step things up from there a bit a higher load pressure plate will help a lot. In a W58 I wouldn't bother with anything more.
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