Location for 3" Tube on Pass Side, 70 Duster

If the pictured headers with reducers/extensions are the same part# i would just get a couple 45degree bends(can easily be found drawn on a short 4" radius but a 5" or 6" would probably be ok aswell). dont look like a bigger lack of space than i remember from my junk when i ran Hooker supercomps.
If you cut the first bend right at the tangencypoint its not going to use much space at all and if if you weld the tangencypoint of the first bend right to the 3bolt flange its probably even going to be to short for your application.
IF all else has failed just cut some lenght from the collector its no big deal.
Also dont worry about cutting down a few bends,its not a big deal you will probably find a use for left over sections further downstream as you keep on building.