Was wondering what intake to run on '71 Pontiac 455- Holley street dominator or Edelbrock Pontiac Performer? Have a 66 326 w/ Edelbrock, changing to '71 455 w/ a Holley intake already on it. Which would be a better choice? (Am pulling the heads on 455 anyway to change valve seals). Do I need specific gaskets to fit the name brands? Also, is there a gasket made to block off the exhaust crossover passages, if so, which ones?(am running electric choke). desperate for answers. Thanks.