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 1957-95 HiRise Aluminum Intake Manifold [Polished]
Speedmaster® Chevy SBC 350 Complete 6-71 Roots Supercharger Blower Kit
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
Speedmaster Small Block Chevy SBC 350 4-Bolt 12-Point Main Stud Kit (Studs Set)