I selected the Edelbrock based on runner length as it relates to my application. Centri blower, 314cid, 4c converter, 3.55 gear, transbrake etc. I figured it was longer than CJ and other billet manifolds, but shorter than 2018 for a good compromise of mid/high rpm performance. Cost was a factor also. I needed aluminum and wanted to run the stock TB, Edelbrock it is. Few pics that helped me with the Edelbrock choice.