RPM Airgap?

I am running a 73 Scamp with a 70 340. A good street/strip package. Fully rebuilt motor 30 over with purple stripe cam, 3000 stall converter, 3:91 gears, Holley 650 carb. Stock fresh heads, no real tricks. The car wieghs 3600 lbs with me in it. I am currently using a Holley Street Dominator intake. I am thinking of switching to an RPM Airgap.

Does anyone know what I could expect? I drive the car sparingly, just for cruising and showing, and a couple of times a year to race in street trim with street tires, driven to the track which is 80 miles away. It now runs high 8.70's in the 1/8 mile with a 60 ft of about 1.97.

I should also mention that I've been running this motor for about 25 years, so all of the rework was done then. It probably has about 15k on it.