I think you will have a hard time making it fit. The space between the drop in the center (where the dash sticks out) and the bottom is too short for the holley screen. I'm sure if you're willing it can be modified but it will be a tight fit.
I am looking at putting a racepak IQ3s in my car and it was a TIGHT fit and it's over 1/2" shorter.
This is my DSE dash with the IQ3 set in the position it would be installed and as you can see it's very tight fit.
The racepak dimensions are a good bit smaller than the holley in height.
Holley is 4.625" tall and 7.5" wide. Width should be no issue, but height will be the difficulty.
William