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I would suggest that with a tri-axle being as large as it is, a 454 might be a better engine for such a large coach. When we were kids, our fam had an '85 454 and it towed 6k lbs like it wasn't even there.
I have a 350 and I can tell you that it does strain a bit. Solid engine, but I am only towing between 19 and 25'. I'd think with a 34' the 454 would do a better job than a 350 might. I think that the 3.73s would be fine. If you happened across one with 4.10s great, but the 3.73s are more than up to the task. Sure the 4.10s are a bit better, but they also lower fuel economy a bit as they really are not great highway gears...not that the 3.73s are much better, but as for having enough grunt to do it, a 454 with 3.73s would be just fine.
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