Hi Dennis. The stacks you are showing are perfect for what you want to do. They are the Best of both worlds, In that they will give you bottom end and top end. Those stacks you show are Tapered at the bottom for lowend Velocity. Older stacks were straight. The Taller the stack the more bottom end, the shorter more top end. I have a set on my 427FE. Stacks operate just like Fuel Injector stacks.
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