Funny Question i must be the 1st person on earth to downsize in hp ?
There is nothing worse than a car you can't drive or find proper octane fuel for when out and about.
I like a fair amount of power so I always use a mild big block that I can burn pump gas in, and still drive it down the interstate at speed.
Your ultimate engine choice will be up to you, but since you have a good selection to choose from I would use the one that's in the best condition and go for it.
Tom