In a Pantera you don't need a second tower and actually the
There is actually a tricky little modification that you need to do to the Pantera throttle cable in order for it to work in the Pantera with this manifold. When you get to that part, ask me, I'll explain it.
The manifold on the left is for the 4v iron heads, the right for the A3 heads. Look at the top of the intake runners near where it mounts to the heads. See the difference?