Blue smoke is oil. You probably were running too rich after the rebuild, causing ring wash, guess what.. now you have to overbore and hone again, get oversized pistons to match the new bore.

You dont -ever- break in a rebuilt motor unless it is ON the dyno or have a wideband attached for a proper street tuning. From idle to partial throttle you tune it so that your A/F ratio is right where it should be. From there, drive keeping within the "low" maps to a dyno for WOT tuning.

You don't just slap on an unknown ECU/tune with a rebuilt, it's posted all over the place. I may sound like I take it personal, but damn, it's all over the place from those that ARE knowledgeable. So, I just don't understand why some insist we haven't a clue when we give advice. Maybe I will open a shop around here despite the area being over-saturated with niche market business... looks like business would be fairly decent.

Sorry to break the news to you, but, this is very likely what happened. Do a leakdown test (and throw a compression check in there more for shits and giggles) and find out your answer for sure.

That or the rebuild was shit with improper clearances.. tough to say, I didn't build it to know for certain.