The kit includes the RPM Air-Gap Dual Quad intake, two 500-cfm Thunder ... is intended for the '55-86 SBC cylinder heads, while the Vortec manifold (#7526), also in its as-cast finish, is intended ...

This all-encompassing package includes an RPM Dual Quad Air-Gap intake, two 500-cfm ... available to fit both standard SBC heads (like ours) and the later-model Vortec configuration.