So I've just finished a full rebuild, started the engine today for the first time, and the lifters are REALLY noisey, I'm hoping it's just a case of the oil not being fully pressurised yet and not all the way round the engine yet, I've only ran it for ten mins, tomorrow I'm going to let it reach operating temp and see if it stops, everything was installed correctly, so I'm baffled really, I'm hoping it quiets down once the oil is warm and thinner? Also there is smoke coming up from the engine bay either side of the engine, there are no leaks so I'm hoping it's just all the oil and wd40 etc burning off the freshly build engine? I'm just hoping for the best! Haha

It is normal to get a lifter tick after a rebuild, once the oil is in the lifters they should quieten down, shouldnt take long to fill up though. Run it for longer to get up to temp and keep an eye on it.