What Bell Housing for BB Duster?

Well, if you plan to do any drag racing, I'd advise going with a forged flywheel and a scattershield instead of a bellhousing. However, it's your life and limbs.

If you do decide to go with a scattershield, I see used Lakewood big block scattershields for sale at swap meets, ebay, craigslist, and Mopar related websites.