- Same as manifold P/N 12363420 (see above), but designed for use with a Holley carburetor
- Dual-plane design requires bolt kit P/N 12367959, which includes 16 bolts (8740 chrome-moly 3/8″-16 x 1.5″ with 3/8″ hex head and 16 5/8″ O.D. washers), and manifold gasket kit P/N 12366985
- Accepts air conditioning and alternator brackets and a late-model water neck
NOTE: Will not fit production Corvettes, and may not fit Chevelles. Manifold carb flange height is 4.450.”
NOTE: Open carburetor spacer is not recommended with use of dual-plane manifolds.