If you want to run a roots style blower but you do not want a broken crank than you must employ this Speedmaster Billet Crank Support.
Speedmaster® Chevy SBC 350 1957-95 Mid-Air MidRise Air Intake Manifold [Satin]
Speedmaster® Chevy SBC 350 Complete 6-71 Supercharger Blower Kit Free Shipping
Speedmaster® Chevy SBC 350 Blower Drive Kit For 6-71 8-71 Roots Supercharger
Speedmaster Chevy SBC 350 Intake Manifold Gasket Set - 2.21" x 1.31" x 0.060"
Speedmaster 1-147-013 Chevy SBC 350 HiRise 1957-1995 Intake Manifold Satin
Speedmaster 1-147-003 Black Low Rise Non EGR Intake Manifold for Chevy SBC 350