i replaced my head.. now my car won't start...


what i need to know is how much the "timing" matters.... like my car was at one point... the pistions were arranged in what ever order they where in the valves and the cams.. all that..

now of course they are all different because i put a new head on so of course it's not all in the same "timing" that it was before.. does that matter when replacing a head.. do the cams and valves need to match up timing wise with the pistons as it was when u shut the car off last?