I have the hedman style headers on my 74 Duster. Much easier if they are already in car before putting motor in. Plus the fact that you have to snake the steering center link through the driver side header. Headrers are nice but changing the starter went from a 45 min job to a 2 hour job. Mainly because you have to disconnect the inner tie rod and the steering box arm from the center drag link, then push the drag link out of the way and turn the steering wheel all the way to the left, and then turn the left front tire to the right. Thats just to be able to get the starter snaked out of that hole. Oh- def get a starter heat shield!!! Not really needed, but there is alot of heat going around that starter with headers. They are cheap enough and can prob make one yourself.
Mine is a 74 Duster 360/904 with power steering and front sway bar.