We used to do this on a fairly regular basis but with the weld it up yourself IFS kits now available it's probably both time and dollar wise to go with a kit. While American Motors Pacers were still available that was the VERY best IFS for an AD and a one day bolt or weld in. That ship has sailed so back to your set up. The tires will stick out from under the fenders and both look ugly and crash into the fender bead, especially while turning. Having both widened the fenders and narrowed the cross member the latter is the easier. BEFORE you start anything put a level or angle finder across the upper A-frame and get the anti dive angle as the unit will have to be joined to the AD frame at this exact same angle. The whole unit wants to roll over and is a b!tch to keep in position but the solution is to tack a U-bolt to the very back of the rear lip and raise with a hoist. Once raised to the position where the anti dive angle is correct cut four pieces of 1/2" all thread and get four rod union nuts and screw these to the bottom of the all thread. You will be sectioning a 3" strip out of the cross member so tack the four all thread rods 6" apart on the front and back lip of the cross member and use the union nuts to adjust each "leg" till all is stable and the correct angle. Cut out strip, slide together, weld. There is plenty of surface area touching but some feel the need to add a backing strip across the weld. You will have to take 3" out of the drag link and re-position the engine mounts as they are now too close together. The AD frame is 1 1/4"'s narrower than your 84 but since you are narrowing the cross member 3" you have to "dog leg" each rail to fit in the narrowed cross member. Just a small pie cut in the frame flanges about under the front of the cab followed by a cut through both top and bottom frame flange six inches forward will give enough dog leg to fit tight into the 84 cross member. You will wish you had bought a kit but good luck anyway.
