Engine is pulled - 273 rebuild or replacement 360 crate?

If we're throwing out hypothetical builds to the guy, try this on for size:
Have the 273 block sleeved, and bored out to size for some decent CR 318 or even 340 std. pistons. Keep your crank and rods. Throw in a nice .450-.475 ish cam.
You get to keep your existing block and still show off the "273" casting numbers; and not have to change a darned thing to make it fit (because it's the SAME engine). But you'll absolutely confound the Bowtie and Blue Oval boys as to how a 273 just smoked them...