Worth the headache?

Joe;
I have a '75 More Door Dart.
318, Eddy Air Gap intake and an Eddy 1405.
A cam and some other things...
As it relates to you, I have a these Hookers.
Hookers
pushed thru some 40 series.
I agree with some of the above, without the headers, you will not get the benefits of the intake and carb.
Past that, if you ever put in a cam (XE268 is mine) you won't see that benefit either.
Keep an eye out, you can find headers cheaper that that list price. I paid $100 at the swap meet and they were near new with gaskets.

Not sure about the horse power guestimate above. I have no idea how much HP I have. I do know it will light up the tires anytime I want with the 3.55 Sure Grip and finish the quarter mile in 13.7 at 98.9mph.
And that is good with me and still fun to take to the cruise night or the grocery store.