Over the past few months I've been gathering everything I need to convert my 357/th350 combo over to a 4 speed muncie

I have the Trans, bellhousing pedals and linkage but now I'm wondering about a clutch? A friend of mine has a perfection clutch new in the box never opened its a borg and beck style ceramic button clutch for these years of truck but the problem is its a 12" clutch and iI am wondering if it will work with the bellhousing? Any advise?