273 white smoke

It is white or very light blue? White is steam from water vapor in the exhaust, which is normal under the right circumstances. If it's a lot of steam, it could be a leaking head gasket, cracked head or block. Probably not the case with t new build. Grey or black smoke indicates a rich mixture. If it is light blue with only 200 miles on it, drive it. The rings will not seat until sometimes a few thousand miles.