You can get the linkages right by doing the firewall turnbuckle forward.
Remember that your 4 bbl sits farther forward than the 2 bbl, the 4 bbl linkage sits more to the left than the 2 bbl. Your Mid Rise intake manifold sits 1" taller than the stock intake manifold.
So all of this plays into getting the geometry correct and lined up with the proper length throws. find some pictures online of the same engine, trans, and body style, and carburetor and copy that layout.
At wide open throttle you want the pressure valve arm on the trans at full stop. Good place to start. Can adjust it from there as where you want your kickdown to come in at.
