2006 BMW 318i Two big problems

I have two big problems with my car that I just can't figure out.

Firstly, It's blowing white smoke and the engine oil is turning a milky white, Head Gasket? That's what I thought except I'm not losing any coolant, all levels are topped up and the running temp is fine. There is a strong smell of fuel from the engine oil though. Could a bad fuel injector cause these symptoms?

Secondly, my car is running at a very high rpm to gear ratio. For example; In my experience the usual ratio would be about 3000rpm to 140kph/85mph 5th gear (or 6th in a 6 speed gearbox) but my car is hitting 4000rpm at 120kph/75mph, 2500rpm at 80kph/50mph and so on. Fuel injector? Clutch?

I've just put huge money into it to replace chain, guides, tensioner etc. But things aren't looking so good.

Any feedback would be very much appreciated!