bellhousing swap

I wondered....My clutch is the factory sized clutch and now that my motor is all strong and stuff, it sure does slip a lot, especially when try to do a burnout....
So in order to get a stronger clutch, do I need to change the bellhousing and what would be involved as far as z-bar and linkage and stuff. Does the floor pan need to be altered. I have a 65 Barrcuda with a built 318 and a 4 speed transmission.
Is there a particular car that could be a donor for the required equipment?