1977 highboy headers
https://www.ford-trucks.com/forums/8...y-headers.html
Flow tech https://www.jegs.com/i/Flowtech/387/12520/10002/-1
https://www.ford-trucks.com/forums/1...-4-1977-a.html
IMO try to locate some fenderwell exit ones that way you do not have to work all around the front d/s, cross member ect...
My left pipe crosses to the right side of the transfer case under the crossmember ahead of 2 48" glass packs side by side then the tail pipes split to behind both real wheels . it sounds great and I have no fitment issues.
There is a custom header made for high boys specifically though I don't see the need. I don't remember their name but they have a website.












