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That trans is a short version. Some RVs had it, some didn't. There is one shorter 727 that was put in aircraft tugs with a slant six but they are a bit unusual to find. I agree that you should at least mock up the sheet metal in place to get an idea of what space you have to deal with. The...

Like Sermis said, the NP200 is an old case that was not designed to cope with todays highway speeds. Prolonged use over 50 MPH has been known to overheat them to the point of cooking all the fluid out of them. A NP205 is a much better case. On the drivetrain length, just find a 2WD short...

Remember that you can cut a few inches out of the intermediate shaft between the transmission and transfer case to gain a few inches. I would go ahead and swap to a NP205 transfer case while you are at it though. The NP200 is a crappy case for daily use.

I'm pretty sure the RB block swap has been done before. It might be tight around the manifolds, but my 318 fit with ease so a big block shouldn't be a huge hassle. Might have to modify the firewall a bit.