68 C20 exhaust questions/opinions

[Mtrdrms]

Hi everyone. So i have a 68 c20 that I'm bringing back from the dead and with the help of a new carburetor and gas tank, ran for the first time at least 20 years today. My new dilemma has to do with exhaust. The truck has headers and my questions are 1) how do I identify the brand? They are white and the drivers side collector exits straight toward the rear and the passenger side exits about 15 degrees in a downward direction. And 2) what is the best way to go about getting an exhaust bolted up to these unkown headers? I can take it to a my exhaust guy and have him fab up something for $$$ or I have seen kits available from summit and others that look ok but don't really have great reviews. Any suggestions or advice?
Thanks!
Andy