it depends on what you built it with

if you went with new sleves and forged internals i'd say drive the piss out of it as theres really nothing left to expand


:edit:

i am not responsible for you blowing the engine for taking my advice. but it is in my general knowledge that forged interals do not expand under heat as much as others. and i believe this is the only thing you really need to let break in on most current engines (let the pistons and other internals expand as they will, not excessively fast due to high speeds and heat too early in their lifespan)

i highly reccomend searching for confirmatino of this online, but i just want to introduce you tot this topic i saw somewhere (i believe i read it twice, once somewhere i dont remember the second being an attack on the guy saying you need to kick the shit out of a brand new car to break it in correctly)