You might want to edit the first sentence, cause I'm guessing you didn't put on "headers" plural.
May I asked what possessed you to put on a header, yourself, with no prior car knowledge? It's not the toughest job, but it certainly isn't something I'd recommend someone with ZERO experience doing on their own.
As was already mentioned, you aren't going to get much performance out of that car without some serious work, and even then you are limited. Something about the engines displacement being less than the bottle of Pepsi I have in the fridge.
Did you keep the old exhaust manifold? Have you tried seeing if the gasket that was given you for it works with the old manifold? Maybe the header you have is the incorrect one?
Hope you get it all figured out man.
