[Excaliber]

I think it's mis-leading to say a 427 is a "punched out 390". Following that logic a 351W is an early "punched out 221", or 260 or 289 or maybe 302 or whatever.

Perhaps a 390 is a "punched out" 352? Or was that a 331? How about a GM siamese 400 being a "punched out" 265? Or was that a 283?

Just because an engine is in the same family doesn't make it the same engine. A 302 is FAR from being a "punched out" 289. While it may be "accurate" to say that, it is not "true".