Seeing how I'm not an instructions kind of guy I took your word rusty and checked them out. The only that stands out to me is them calling to cut up the kickdown linkage and reweld and install 180 flipped? Anyone done that before?
I didn't have to. had plenty of clearance. you will need to remove the oil filter and add (after the header is on) a short oil filter (people hate fram filters but I use a PH43) if you don't have a 90 degree adapter. I also use 45 degree spark plug boots on the #5 and #7 plugs. never burned a wire. it was easier for me to just loosen the motor mounts and move the engine around as I needed to get the drivers side on first, then the passenger side went right in. a good tip is to make sure and leave the front and rear exhaust studs in to prevent water leakage and the ability to hang the headers.