I'll answer what I can based on my experience and perspective and let the experts
handle the rest.
1. Nothing really. The two engines share no internal or external common parts. The only thing they share is the bellhousing pattern. So any transmission you put behind a 350 will also fit behind the 292.
2. I'm not sure here, but I don't believe that the 350 motor mounts will fit the 292.
3. The 292 works great in a Jeep CJ7/Wrangler. Especially when equipped with the extras you mentioned and a rock-crawling SM420-465 transmission.
4. It depends on the first gear of the transmission in the Jeep. If you have an SM420 or SM465 then the setup you mentioned would work perfectly. Likewise with some of the 4.03 first gear T5s.
5. I can't answer this one.
6. The twice mentioned SM420 or SM465 would work great with the 292.
7. Safe redline? For a 292 with a mild cam, 4 barrel and headers, properly balanced bottom end and stock pistons I wouldn't be afraid to turn 4500 rpms and
maybe an
occasional bump to 5k probably won't hurt things. Remember that the 292 is a 4 1/8 inch stroke engine with a 73 pound crankshaft and
very heavy rotating assembly that's not built for high rpms (heavy, low compression pistons, long rods). It's not designed to spin fast.
8. In your jeep you'd probably get 11-13 mpg, properly tuned on the highway with 3.73 gears at 55-60 mph.
Hope this helps. Others with more experience than myself will be able to give you better answers.
-magic mike-
