Plenty of folks have re-powered scouts with engines from some other make. Searching not only this forum but pirate 4x4 and binder planet will unearth much information regarding this undertaking. Rest assured, you will be in for considerable fabrication work which gets expensive in a hurry unless you already possess the necessary skills and tools.
Ever heard of the mushroom effect? It's what my local Scout buddies and I call a project of enormous undertaking with unforeseen twists and turns that pop up along the way. Meanwhile, the project vehicle you were so excited about enjoying the heck out becomes el projecto creepo. Just a big gut pile of assorted parts in various stages of assembly, taking up space in the garage. That's when most people lose interest and decide they'd rather let the whole thing be someone elses problem. This can happen frighteningly fast if there is a spouse involved who doesn't possess the same "vision" for the rig as you.
The only true bolt and go option is to stick with an ihc v8 engine. You're likely to incur significant upfront expense in sourcing the complete, donor drivetrain package for starters. Then what if the sbc you wind up with needs a complete overhaul before you swap it in? Most of those engines are ready to puke the entire top end by the time they log 150k miles if they make it that far.
What methodology have you used to determine that your running 266 is in dire need of a rebuild? Perhaps all it needs to make it happy is some tlc. A thorough freshening of the entire ignition system...points, condenser, plugs, wires, distributor, adjust timing...and freshening the entire fuel system might do wonders for the ol' feller. All of which can be done far easier and cheaper than a total drivetrain swap.
If the end goal is a reliable, low maintenance occasional to daily driver, you'd be hard pressed to beat a healthy and sound IH v8 engine.