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I bought a trans fixture similar to that and just stuck the shaft in an engine stand with a few pieces of exhaust pipe to make up the differemce it worked quite well....hell still does, lol
I agree with those who suggest lower stall RPM. A high-stall converter would be miserable on the trails; it won't crawl and will overheat. You're geared low enough for a stock 13" converter. Multi-disc lockup clutches are relevant to high power-handling during wide-open-throttle lock-up, also not needed for this.
Which is part of the reason i went with the converter i did, it is basically a reworked trailblazer 4l60 converter, with a slightly higher stall, my truck will crawl, even with a 3000 stall, reverse takes a bit more rpm to get moving, but rarely do you use reverse anyway....