327 dreamers always make me chuckle.
Hello...It is just a nice sounding number guys. Just like a 427 or a 396. During that time chevy was making slogans from their cid values. It was just advertising.
The real power is all in the heads. The block just needs to hold together. My 350 revs to 7200 rpm with out any problems because it has the cam and heads to do it. Even a "magical" 327 can't rev like that without the right parts. Maybe a 327 revs a little better because it doesn't run out of cylinder head as quick as a 350 because the 327 isn't making as much HP. And have you seen a stock 327 piston! They are very heavy and long as compared to a 350!
The same thing goes for 427's and 454. If built the same, the 454 will kick a 427's butt everytime.
I have had 327's and 350's. 396's, 427's, and 454's. And every time, more cubic inches make more power.