SN95s used their own bellhousing and input shaft, the rest of the transmission is identical size wise. You will need:
-Fox clutch fork
-Fox input shaft
Input shaft swap is very easy. DO NOT get lowballed on the SN95 shaft when you go to sell it either, they are rare and sought after.
Also, are you SURE that its a SN95 trans setup? I had a fox setup in my 95 because I had a TKO and they don't come in SN95 lengths. Or if this is still a stock T-5,
1-A stock T-5 is not usually going to live very long behind a good 331 (there are some factory freaks but its rare)
2-Are you sure it isn't already fox swapped since its much easier to just do a fox swap sometimes than it is to source a SN95 bell/input if the car did not have it originally when the previous owner got it.
I've seen some crazy ish on cars I've looked at and owned which is why I ask.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.