For all practical purposes, Jim Dove had three different exhaust runner layouts. One was the stock FoMoCo design.
His second design had the angle of the runner raised to straighten the path. It also had different spacing. And, to finish things off, The shape of the runner was also changed, with one of the lower corners being filled in. When I used second design exhaust runners, I had to use full custom headers. They're easy to recognize, since the extended end of the runners as you look at the outside of the head, common with FE heads, look entirely different just at a glance. And you can roll a piece of paper and shove it into the runner. It'll stick UP at a very significant angle, with the head on the bench in an approximation of the orientation of a head installed on a block.. The primary pipes coming off the flange should follow that same angle for at least for six inches or so before attempting any curve away from straight. There is NO WAY to use the second design in any car with the intruding spring pockets. You'll have to remove the entire construction, lower the pivot for the upper arm and move it outboard, and shorten the upper arm to re-create the proper geometry. We did it on Brother Lon's '67 Mustang. To get enough room to not compromise the header design, the front suspension required Coil-over shocks moved out into the wheel well and acting on the lower arm. The upper mount was incorporated into the stainless plate we fabricated to fill in the window in the inner panel where the spring tower was originally placed.
Dove's third design was much less radical and simply necessitated raising the header flange up about 3/4 of an inch, in effect raising the entire header.
Since Dove had the ability to mix-'n'-match the features he put into a given head, you need to be very sure as to what you have in a given head. The set we used the second design on had a TP intake side. Good luck!
KS