None you can see that I know of (390 vs 428)! Without very close inspection the same could be said of the 427 as well. So whats the big deal with a 427? Braggin' rights? Maybe for some, OK, you ARE going to brag if you have one.
BUT, you need to build/design a car you are personally happy with. Don't do it to please someone else. Like the Webers, if thats why a guy wants it's OK to splurge there, then save some money somewhere else (like a 390 block). All of us have a budget, some budgets are just bigger than others, but we ALL draw the line somewhere.
So you get the 427 center oiler, then someone ask's, "Is it a side oiler?" If it's side oiler they might ask, "How about the OHC 427. That's the best!" You can't win, there is always the "next level".
You get the Webers and the guy parked next to you at the show has chromed Webers! Dang!!!