Then don't even think about starting it!

If the timing is wrong you will cause serious engine damage!

The two cam pulleys arrows should face each other and the auxillary pulley (Dizzy) has a scribe the pulley should line up to as well, alternativly the rotor arm should face the 2 o clock position iirc, crank pulley has a notch it should line up with.

You need to be absolutely sure all this is correct before you even attempt to crank it, the noise could may well of been a valve or 2 getting struck

All you can do is time it up and see how it goes...

Martin