HELP! Header gasket replacement

you would need to know exactly what heads are on the motor as the exhaust port design/shape can vary from one to another, if the motor/heads are original to the car then getting the correct gaskets the first time shouldnt be a problem. To change one or both you would need to take all the header bolts out and see if you have enuff room to move the header flange out 1/4-1/2 inch, just enuff room to take out the old and put in the new, thats if the old one comes out cleanly, if not your gonna need some room to do some stuck on gasket scraping to get ALL the old gasket material off. You wont need any gasket glue on a new one however you will need to put a good thread sealer on the exhaust bolts when you put them back in as they go into the water jackets in the heads (on small blocks I think they do LOL)