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This is the carburetor side Tillotson HL with a .875" throttle bore. The Tillotson Flange gasket makes a seal between the carburetor and the intake. This flange gasket has a pulse hole that matches the pulse hole on your carburetor. The pulse hole should also match your intake manifold. Make sure you punch the hole for the flange gasket before installing it.
Beware of intakes using a notch instead of a complete circle. This exposes the gasket to fuel that may deteriorate the paper gasket,blocking the pulse hole or create irregularities in the pulse. This can have a huge influence on the tune and performance of the carburetor. If in doubt, use only EC Built Intakes.