Run the engine until it uses a quart every 10 miles. Then, a crate motor is a no-brainer.
The way I look at it is: do I want a billion parts laying around to get dirt in them while I find the time to take that block down to the machine shop to be cleaned, sandblasted, bored & honed to my new pistons & rings .... which I will have to order, among other many parts ... then truck that whole monstrosity back without getting any more dirt in it .... then paint the block so it doesn't look like a Massachusetts overpass in one winter, wait for the paint to cure without getting bugs & dirt in it,
......... OR ..... go online & "CLICK" -- whole engine appears at my doorstep in a few days.
Like I said .... no-brainer.