Q: aggressive cams with stock valve train

alright, i plan on building my engine up over the winter. its a jdm b18c(1). the engine is in the car. here's the issue, i have most of the parts now, and im anxious to put the cams in. If i tear the engine down now, send the head out, the thing wont be back up untill the end of fall probably. I bought the motor from an importer that advertises "approximately 40-45k" on the engines. i've only put 2500 miles on the engine since then. What if i put the Crower 402-2's in now on the stock valve train? How damaging will that be to the valve train to use them for about another 3,000 miles before i rebuild the head in the winter? what do you guys think?

EDIT: do u think getting CTR cams would work better for now?