break-in period?

[james.mccoll@sympatico.ca]

A have a question about my engine swap project.
I'm putting a BB DET engine in my NX2000, and I've
swapped the main, crank and rod bearings.  The
engine supposedly has fewer than 60,000 kilometres
on it.

I've put in JWT S4 cams, which have been used in my
car for a number of years, so they're not new.  I'm
also installing a brand-new Bully Clutch (www.bullyclutch.com).
Incidently, this is the car's first clutch.  The stock
clutch is still going fine at 208,000, but I didn't think
it would hold up to the extra power, and it's gunked up,
and the effort has become more and more stiff.

Is there a break-in period required?  I'm not just going
to jump in the car, fire it up and immediately rip on
it or anything, but I'm wondering how long would be
considered a decent amount of time for everything to
be worked in enough to where I can really rag on it.

Thanks in advance,
James