Just in case things go wrong, and they very well could. If you have access to the data, copy it off.
Some considerations:
To actually help you, there are too many variables and not enough info to give firm advise here. I would want to know why you want to do this actually. Other than being able to use old installed programs on that OS image you want to clone, why not start with a new OS updated and able to address today's websites, as well as security concerns. I have to think you good reason to want to do this, and I can think of a few myself! Edit: I just re-read your post and see your reasoning. So really, I think you just need to be able to get that data off so it can be used in any environment. - rather than clone it. Can you export the data? - end edit
I do know this, newer computers use a different method to 'boot up', and so if say, you are taking a clone of this drive to use on a new computer, there may be some BIOS setting changes needed in order to boot from the old style way of doing things.
And when cloning a drive that is supposed to "boot up", you have to do it differently than just copying. Depending on how you are making the copy. You have to make it 'bootable'. I think this has to do with a lot of hidden system files that have to be copied to a specific place on the drive.
If all you want is access to data and files, then easy peasy.
- just trying to be helpful, but by no way committing to help someone do this - online. Oh no, not me. But... There should be step by step documentation on how to do this found online.