Since you mention a 1366 socket, I assume it's the HP Z400 you have in your signature. IIRC, not only the PSU is a proprietary design that won't fit regular cases, but also the motherboard has a proprietary 24pin connector. Is this the pc you're swapping? You might have some trouble if it is.
Edit: yep, just did a quick googling, someone in LTT already tried this case swap and failed. It required a second try and a fair bit of modding.
Last edited by jonny27; 09-26-2018 at 02:53 AM.