Looking at a 5.9 Magnum engine..

Hey guys, just wanted to think out loud. I was just down at a local salvage yard and noticed a ton of 5.2/5.9 magnum engines in trucks/vans, so curiously I asked what they get for them and I was surprised that they are only 350ish with a warranty or under 300 without a warranty. And they told me that coming up is a half price day, so I could get a complete Magnum engine for less then 200 bucks.. Right now Ive been focusing on getting my 64 Valiant wagon back on the road after switching to a 65 a833 4 speed, disc brakes, and an 8.25 rear. But seeing that I can pick up a 5.9mag so cheap, even if I just put it to the side and planned for a v8 swap down the road it doesn't seem like a bad way to go. I know Im going to need a few things anyway (proper exhaust manifolds, center link, motor mounts, carb intake manfold, dual exhaust, electric fuel pump, 360 car oil pan, bell housing, flywheel, clutch, ect). I think it would be a good trade up from my slant six with a 4 barrel, to a mag motor.. Any thoughts?