So instead of Both, it's None-of-the-Above ? :)
But yeah that's a good thought.
Keep this engine complete as a package for either to sell it as is, or use it in another project one day.
Then again, going the Hemi-route, besides the power steeringbox changeover, also means a crapload of rewiring has to be done, stock computer or aftermarket (steep learning curve), actual fitment of the engine in the tiny engine bay, custom enginemounts, expensive headers, custom oilpan, custom oilfilter setup.
How long will the car sit idle in the garage when all is said and done?
A built-360 will be much easier/quicker to install and have fun with.