I got the 2.5" race pro header back system with the x pipe for mine. You just can't beat the price, and it's stainless. Sounds good too. As far as headers we'll need to get an Olds guy in here. Anyone?
Just get the headers for the stock engine. The 307 is exactly the same dimensionally on the outside. Make sure you look under the "check to make sure this part fits your application" part and be sure it says Oldsmobile(not Chevy!!!) under the engine family part.
I just put some headers in my 82 with a 350 Chevy. I went with Flowtechs, buddy said they were good runners.... Well they fit pretty good but I had an issue with the stock shifter linkage. The bar from the frame to the transmission would hit the top of the header tubes. they dropped the header down real low on the drivers side.I had to cut the bar and put 3 seperate cuts in it to get the geometry right 95%. If you have a floor shift its fine I wanted to keep the colunm shift for the sleeper look. Good Luck Steve
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