Well heck, the 336 wouldn't fit here.
If you would be OK with a V8 a brand new crate motor is hard to beat. Not a classy though.
Is the 270 close enough that you could give it a good inspection before you buy it? Is the price negotiable?
It would give you a chance to make the most beneficial modifications while you assemble it. #1 better intake, #2 better exhaust, #3 a cam more suited to your use. A totally stock 270 may be best suited.
