To hit the points:

1. The DM does not prematurely fail... it dies at 120k. Done. The problem is that the DM acts much like the spring in a conventional sprung hub clutch friction disc, that wears, so does the DM... sad, really. With that said, yes, the F-body SM will work, just cut .090 off. You will use a Corvette pressure plate and an Fbody friction disc.

2. Are you cranking out 450hp? If not, stock, organic clutches are just fine and maintain easy street drivability.

2a. Whatever you do with the clutch, if you go away from the DM, you will have to get the SM "match balanced." This is when the intentional out of balance of the DM is applied to the SM. If not, serious vibrations will ensue. Sad, really.

3. I have beam plates. I like them. If for no other reason than it makes reinstalling the c-beam that much easier. It also helps cut down on the swing to the right the rear end does under hard acceleration.

I would consider doing u-joints.

I totally agree with bogus on the merits of staying with the dual mass flywheel, unless you have 400 plus ponies under the hood and you intend to use slicks at the drag strip. I changed my clutch, flywheel and release bearing out at 40 K due to an oil leak from the rear of the intake manifold. Oil got all over the clutch and it was slipping badly. When you do remove the clutch, you can check the dual mass flywheel for excessive rotational play, just checkout the Helms Service manual. I got a good deal on e-bay on a flywheel, clutch and release bearing from a crate engne that was going into an automatic. Paid around $450 for all of it.

Balance---very critical on LT1s from 92 and up as this is an externally balanced engine and the flywheel is used to quiet the vibrations in the LT engines. There is a series of holes around the outer edge of the dual mass flywheel that weights are driven into to achieve balance. You have to match these weight filled holes with your old dual mass. While you're in there, replace your rear main seal, yours is getting old. I went further and replaced the oil filter adapter gasket, rubber O-ring and since it was easy to get at, replaced the fuel filter. Yes. beam plates are a good thing. Now would be a great time to install a new short shifter like a Hurst. Don't forget to flush out the hydraulics in the clutch.

Oh, I forgot, if you want to know what a single mass flywheel sounds like at idle, just find a small box and put several large ball bearings in it and roll the box over and over. It's embarrassing when you pull up to a Mustang at a light.

at 49k, it's questionable. Techincally, they last about 120k, so it look at it from a time issue.

From that perspective, I would use it. Hell, at 49k, you have atleast 50k more to go... and I don't get the feeling you drive it that much.

Simply scuff it clean and go for it.