So, as everyone has heard this "run it in like you'll drive it"

My question is this though
Say I build an engine, which will rev to 9,000rpm (example figures only)
But at the time I don't have the money to do cams, intake and exhaust
And therefore this engine will not make much power after 6000rpm
So it's tuned with a rev limit at 6500rpm

What happens if I run it in, and drive it hard to the 6500 limit, and once I get more money and do cams, exhaust, intake and raise the rev limit to 9000rpm

How will the engine wear react to that?
Is this ok or a bad idea?