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A tunnel ram would be 2-4's.
Is this a mud truck, or something else?
A Tunnel ram can be one four, two fours, three twos. Any combination on a tunnel ram manifold. This is actually not a tunnel ram per say, It is a single plane high rise but it is the same basic idea. The Dart engineer is being VERY optimistic! A lot depends on the cam. You are going to need a bare minimum of 290 at .50 just to move enough air in that thing and I am betting you are closer to 312. It may start to pull at 3000 but it will not produce any real power until 4000 and up.
Edelbrock #7161 would be a good choice. That would give you bottom end starting at 1500 depending on the cam and what carb you are using. For street/mud you don't want to go above 750 cfm.
Rick