Dual Plane vs Single Plane Manifold with TBI

toolmanmike said
The D4B's were for 64 and 65 heads with 5/16" bolts at closer to vertical angles. The LD4B intakes are for 65 and newer 273/318 heads with 3/8" bolts closer to 90° to the intake surface.

OK great, ^^^^ so for the sake of conversation the '89 - '91 318 TBI intake manifold will bolt up to those '66 273 Heads.