FX 6300
8 GB Ram 1600 MHz
GTX 960
Win 8.1 64 bit
1 TB hdd 7200 rpm
That’ll be absolutely fine for ue4. I’m on a laptop with a k3100m (equivalent to a gtx 750m) and it doesn’t slow me down.
I also have ue4 on a desktop with an i5 2500. Which according to passmark is equivalent to a 6300. UE4 runs even better there than on my laptop (and it already runs good on the laptop).
unless you’re internet is a serious issue, why don’t you just download it and try it out? It is free after all.
I think your PC will be okay, here is the official requirements for UE4: Hardware & Software Specifications