Ported Victor W2

View attachment 1715828966 You can use an inside calipers to measure in your intake manifold, setting it to or measuring it with a scale(ruler). This is how my grandpa who was a pattern maker made patterns measuring with a shrink rule.
And or snap gauges and a mic.

Take and cut on cardboard to size, for instance at the pinch, and use it as a quick gauging method.