If you simply mount the two HDD's in your new machine and connect their data and power cables, they will be completely accessible to you so that you can use their data and / or copy some elsewhere.
HOWEVER do NOT Partition or Format any of your drives!! Your system should not ask you to do that. But even if you are asked / prompted, do NOT do that! Either of those actions would completely wipe out all your data!
You should be aware of two things.
1. Once you have your new system set up with the old HDD units connected, you should check in BIOS Setup exactly how the Boot Sequence is set. It should be booting from your new SSD unit (maybe, depending on your preference, trying the optical drive first before the SSD) but it should NOT have any option to try to boot from the old HDD's. IF you have to make any change in Setup to achieve this, don't forget to SAVE and EXIT.
2. All of the application software you have installed on your old HDD's cannot be used just because you install the old HDD units. You will have to Install each such application on your new machine with its new C: drive and new Windows OS. That new OS has its own Registry files on the new C: drive and they do not know anything about stuff installed in your old machine. The process of Installing an application places new data in the new Registry files so that they can be accessed. In doing this, you will need also to consider these items:
(a) Your old applications have already been installed and registered as such with their manufacturers. So when you try to do an apparent second Install of them on a new machine, that will be a violation of the license and not allowed. BEFORE you try to do these re-installs, contact tech support for each software package. Explain to them that you are moving to a new machine and want to know how to move the software. Ask for clear instructions. They may have a procedure that requires un-Installing their software from your old machine BEFORE you remove its old HDD units, so that the new Install on the new machine becomes the ONLY installation of that software package.
(b) Before re-installing your software and possibly storing data files, plan out where? Most software Install routines assume it should go to the C: drive. For that matter, Windows will already have certain default file storage locations assigned to the C: drive. If you want some of these placed on your transplanted old HDD's to save space on the SSD, you will need to tell Windows and / or the software Install routines to do this.
(c) after you have re-installed the software, many of them also will default to placing their data files on the C: drive. if you plan instead to have your data files on the old HDD's, use the options settings in each software application to re-locate those storage places.
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