I bet you'll never work with an open manifold, at least with something stuffed into those openings, again! Some of the rest of us won't, either.
I think you should listen to the Junkie and others about the normal wear. That bolt would leave damage, like nicks, or worse, not 'belling'.
I recommend that you do this, take a LOT of digi-pics, especially of the vacuum hose and wire routing. I converted from TB to TPI and had many B&W printed pics of an '87 handy so I could put it together. Besides, I HAVE no memory.
I feel that with these engines, there is as much, maybe more, work in getting through the jungle, to the metal (the motor) as there is in actually doing the engine stuff.
Also, when patience fades, turn out the lights and go hug somebody (after hand cleaning) :L
