I have had Dougs headers on my 69 Bird for the past 7 years. It has a 428 making around 475-500 hp. They fit great and never had a leak. My next project is a 421 in a 65 GTO. Not sure yet which way to go as headers are more problematic on the early A bodies. Looking to make 500-550 hp with this one. I hear tri-y headers fit very good, they may be worth a try if they would be available.
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