I have recently replaced my water pump seals and since i had oil leaks coming from the head, i decided to replace the headgasket too.
After buying a new one and installing it, i put my camshaft in and when i try to align the mark on the camshaft with the mark on the rocker arm, the piston hits the valve. Second of all, there is a second mark on the camshaft 180 degrees opposite of the first mark. So how would i know which mark it is first of all, as on mitchell and any other technical website, they just show a picture with the marks aligned. I am not sure what i am doing wrong.
Also On the crank pulley, there is also indications with timing marks. There is also one that says 24/0 and 12/0 but i am not sure what they mean and how i am supposed to set it up.

Any help would be appreciated.. and greatly needed as my benz will just sit in the garage if i dont get help. I just recently purchased new headlights + tail lights and grill and cleaned my whole engine, so i just want to put this thing on the road .. Thank you