Don't worry about it man, we all started somewhere. I'm a total beginner when it comes to v8's myself. I'm no slant expert but I've done the super six swap a couple of times so I'm pretty familiar with it.
You can get to any of the nuts with a long enough extension and deep socket. There's no need for any swivel adapters or anything. You can basically just stick the extension and socket in there and feel around until you feel it grip the nut. Putting the nuts and washers back on is the hard part. I use an extension magnet to place the washer over the stud and then I use a long screwdriver to press the washer off the magnet and onto the stud.
Just make sure you use the correct torque pattern when bolting the manifolds down. Here is an excellent article if you haven't ran across it yet.
Btw - Don't forget the super six air cleaner as well.
http://www.slantsix.org/articles/supersix/article.htm