The sound is going to be personal taste. When I first got my car the mufflers inserts were 90% gone and the the car sounded like NASCAR Live - it was great but the neighbors and my wife didn't apreciate it. I ordered the complete replacement system from Mid-America as it was the only place I could find at he time with decent prices. The Muffler inserts appeared to be galvenized steel with perferations - According to Mid America - their standard offering is the "Louder Version", but I question that now that I have seen the glass pack option.

At first I liked the way mine sounded. But after awhile it started becoming annoying. I do like to listen to the radio sometimes and having a conversation with my passenger. And any trip other than just local, my ears would end ringing. So, I replaced the muffler inserts with a quiter set. It's quieter but still louder than stock, deffinately. Mine are chrome and will need replacing soon. I'll replace them with another set of chrome ones. The only place I get the bluing is in the area of the first bend and slightly thereafter of the heads. I keep my car garaged all the time and drive it very little (1k to 3k ms. a year depending on the weather). But, like anything, it's a personal choice. Whatever you decide on you'll enjoy, I'm sure.

I have these on my 79.  I'm probably repeating some of what was already said....BUT...I had to do some trimming to the rocker panels. The headers come with a sheet that tells you the measurements for trimming the panels. Follow those and you will be golden.  I have the ceramic headers and side pipes..ordered from Summit...no regrets.

As far as what needs to be removed...I have a manual...had to remove the oil dip-stick, clutch assembly (the push-rod that attaches to the block), and the oil pressure sending unit.  Nothing too major. Fishing the headers up under the car will be a challenge. Took me and a buddy the better part of 6 hours to complete the job.

As far as mufflers...i ran open headers for about 5 months. after I failed my hearing test i finally went with the hooker max-flow inserts.  I would highly recommend them. Not too loud, comfortable to drive, but still mean as hell when you stand on the throttle.

Finally...i went with a copper gasket and have the stage 8 header bolts to prevent them from backing out.

Hope this helps, and sorry if i repeated info from other posts.
good luck with everything.

-Shane