Without having your truck in front of me to look at, would it be possible to modify the engine mount tower on the passenger side to be easily removable, as in do something with the mounting bolts to make removal of the mount tower not such a big deal where the starter could be brought forward once it was un bolted? Yes, you would still have to raise, or at least support the engine a bit to facilitate removal of the mount tower, but it would be much easier, once re engineered, than unhooking the exhaust and removing the header. Just A Thought, Had a 68 In Highschool With headman headers, they fit and sounded great, but, like all headers, were prone to leaks and typical header issues.