Picking up another to stash under the workbench

I wasn't necessarily looking for one, but it found me. At least that's what I'm telling the wife.... Wednesday I am picking up a mid 70's 440 out of a motorhome. For $200, I can't afford not to go get it. So now, in 5 or 6 years, I'll have to decide if the 383 or the 440 goes in the 68 B'cuda ragtop, or do I use the 440 to stroke the 383....... oh, the choices at hand.