hey guys, I have an 86 SS El Camino with the stock 305. I was thinking about getting headers, but I didnt know what kind to get. After a little homework, Ive decided on getting shorty headers, stainless, 1 5/8in, with a 2.5in collector. I plan on getting a 350 to replace this 305, and I know that the headers are interchangeable, so I should be good there. I was on summit, picking out my headers, when I came across something I didnt know: do I have square exhaust ports or circular ones? I needed to know so that the gasket would match up. Does anyone know what shape they are so I can go ahead and buy them? Thanks