If you search t-case replacement on gamma goat here, a member here went thru the whole process a few years back with pics. If i recall correctley he used rtv in place of the gasket. But cutting out a paper one should be fairly easy.
Shipping to you is gonna be a killer! That stuff is heavy. Wish you had asked before you bought I have 4 complete extras.
The most difficult part would be boxing it up well enough for the trip.
On the good side at least yours runs! My engine is still in pieces:D
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