Can you measure the distance across those "spreader calipers" at a few depths (head opening, 1" into the port, 2" into the port)?
It looks like the Wilson port match goes in maybe 1.5-2.0"
I figure since I asked you, I would do the same with the Mopar Performance M1 RB intake I have, which is the 4500 carb pad version.
What a nightmare. The shape of the port and angles make the WxH measurements into the port kind of difficult, so take each with a grain of salt. And to make it worse, the inner runners and the outer runners on my intake manifold are noticeably different, not just length from plenum to head, but the longer (outer) runners are larger inside...
