Small plenum single planes work well on even mild engines. The big block SD is the best of them. An original advertisement for the Torker 440 claimed the "New" (1974 ad) Torker single plane manifold when bolted on to the emissions choked Dodge and Plymouth big blocks brought back some of that lost power. Then the add went on to say if you bolted the Torker to a 67-71 engine..."WOW!"

Keep old mopars alive.