You have a combination probably unlike anybody else has.
Rather than buying shelf headers that may or more likely may not fit, i would have the fabricator redo what you have.
By far the best option, and you will be doing it once.... and doing it right

69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8