T56 Conversion

Do you have to run a SFI flywheel? I have a T56 magnum for my 408 and have a MP flywheel from a previous project.

Not unless you're running a class that calls for it. That said, I am planning on it because the cost is nearly the same. Just has to be a 130 tooth flywheel and you'll have to use a mopar 2 bolt starter. As for the clutch, a 10.5 in clutch disc is going to be needed. You'll need a kit from the corresponding T56 model you have, so like a Chevy if its a GM T56.