I copied the chart below from George's Cobra Jet thread. I would guess the VE of your engine with the Holley Strip Dominator is less than 90% at 4000 rpm, but better than 80% at 6500 rpm. That's just my guess based on comments about the performance of single plane intake manifolds.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.