I meant to tell you the long tube headers in the pictures are from a Jeep. They fit with a few dings by lifting the cab about 7/8 inch with e bay aluminum stock biscuits and adding poly cab mounts. He is fortunate enough that the truck was originally a 4 cylinder 5 speed with manual steering. You cannot find new manual racks anywhere. The other interference point is the reinforcement sections that stick out on the inside of the frame next to the transmission. Those really could stand to be cut and replaced with a piece of flat steel, but putting a ratchet strap around the collectors and pulling them together allows them to slide in. The only starter I've heard that actually works like it's supposed to without problems with a Gen3 and a 727 is the Tilton/ATI unit. So far nothing has been inexpensive playing at this level. Oddly enough, everything worked flawlessly around the starter except, of all things, the engine oil dipstick tube, which had to be mercilessly modified in order to fit with it and the headers.
ATI 915566: Tilton Starter 5.7/6.1/6.4L Hemi with Torqueflite 727 - JEGS High Performance