The headers that bcbroncos sells might work
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will the stock mustang headers work?
Make your own headers that exit outside the frame. Much better. less clearance issues. Speedway Motors has a weld up kit for SBF for $150. on sale now for $115. Comes with plenty of pipe, Collectors and flanges. I used it on my 351W swap recently.
https://www.speedwaymotors.com/Small-Block-Ford-289-351W-Header-Kit-1-5-8-Tube-3-Inch-Collector,3842.html