Mike,
Try shopping these. Even if nothing is readily available, I would consider a bespoke unit. Several years ago, a buddy of mine had the clutch assembly let go in his 57 corvette at 9K during a 1/4 mile run; it scattered shrapnel all through the tunnel and footwell. Luckily, he walked away unhurt, but he never ran again without protection. You can't put a price on your health.
http://americanpowertrain.com/p-29455-bellhousings-bell-adapters.html
http://lakewoodindustries.com/drivetrain/bellhousings.html
http://www.deist.com/bell-housing-blanket-p-99.html