Always helps to tell us what it is you're working on. What year? What engine?
Your photo first leads us to believe its a '72 w/340 engine? Then lower down it wants to tell me its a big block 383/440 with A/C?? So how should we answer your question?
Also, there is something called a FSM or Factory Service Manual. Do you have one? Did you consult it first? Or do you just want someone else to do all the research for you?
This is exactly the kind of post that gets me and I'm sure many others to just ignore the post (except this time). If you can't provide the basic information, why should anyone waste their time trying to help you with an answer?
Sorry to be so blunt about this, but sometimes the truth hurts.