Been wondering about which way to go. Have 70 dart with 340, i have just stock 73 style manifolds. Anyone using the shorty's ? If so what kind of power gain did you get. I know the shorty's wont get the power increase like the full length . At least the shorty's would be an improvement over the stock. Not too sure if i want the full lenght due to clearance. TTI'S are iout if the question, too much money