Frankly, you haven't provided sufficient information re your objective(s) so that one or more sensible options could be provided to you.
A. Your current PC apparently utilizes a HDD as its boot drive, right? What's the size of this HDD and perhaps, more importantly, what are the TOTAL data contents contained on that disk?
B. What's the OS?
C. How is that boot drive partitioned? A single partition containing the entire data contents or is the drive multi-partitioned? If the latter, does one of those partitions contain the OS? If so, what's the partition's size?
D. Does the present system contain any secondary drives?
E. What's the motherboard on the new build? Plan to use Win 10 as the OS?
F. You haven't purchased any SSD or other HDD to install in the new build? So presumably, one way or another, you plan to use your "old" HDD as the ONLY drive in the new system and it will serve as its boot drive, correct?
G. You haven't considered utilizing a SSD as the boot drive for the new system? No way you could swing for it $-wise? To build a new system and not employing a SSD as its boot drive comes close to being a curse.
H. Can we assume that since you've indicated a possible desire to "wipe the OS and drivers" from the HDD, you're considering an option to fresh-install the (Win 10?) OS onto the HDD in the new build? So that infers the present HDD does NOT contain that OS. Or does it?
I. So what about the non-OS data on the present HDD, i.e., your programs, apps, personal data, etc.? What are your plans for that data?