Didnt the Holley Pro Dominator for the W2-s come out in 79?

A lot of secrets back then.

Glidden 1980

In an interview with Dave Emanuel in the February 1980 Super Stock & Drag Illustrated (SS&DI) magazine, Glidden stated, “I use the new Holley® Pro Dominator manifold. I want to tell you, that’s one hell of a manifold. I use it right out of the box. All I do is match the manifold runners to the cylinder heads.” Glidden continued, “Holley built it right, so it works. If our ports weren’t so much larger than the standard W-2, I would not even have to port match.” When it comes to carburetors, Glidden prefers his trusty pair of Holley 6464 Dominators.