Something's amiss on that graph...Saleen is a Holley...unless they had another earlier one.
And the Edelbrock is not that good, unless
that's an Edelbrock Victor EFI manifold.
FWIW, I have an article where a NOVI-blown car did 840+ to the tires through a max-ported Cobra Intake. It was a Granatelli car (Red/white/blue coupe said Paxton on the side).
If I were you, I'd get a box-upper for the GT40 lower you have, then you have two intakes in one
...test them.