Wilson Plenum Ported Holley 300-277 8.2 Deck SBF 289-347

Wilson Manifolds - the leader in induction design and technology -  Wilson intake manifolds have shown a 25 HP gain over the competition in independent dyno testing. 

Price includes the manifold and Intermediate porting service.
https://www.wilsonmanifolds.com/pages/manifold-porting

Price includes the manifold and Plenum Porting service with Gasket Match

  This is not a shelf piece, the manifold must be ordered and ported to the customers specifications after it has been purchased.