I am currently running a 1970 Plymouth that weighs around 3120 lbs. The car consistently runs 7.15 in the 1/8th. I would like to get the car down to run in the 7.0 index class, so I am looking at a few options and would like to hear peoples opinions. Here is my current setup:
440 engine
Heads - 906 ported w/1.81 & 2.14 valves
Competition Cam - solid .525 lift, 248 duration, 110 Lobe Sep
Intake - Weiand Team G
Carb - 1050 Holley Dominator
Headers - Hooker Comp 1 7/8
Coil - MSD Blaster
Ignition - MSD 6AL
Dist - MSD Pro
Converter - TCI
Gear - .488 ratio posi
Tires - Hoosier 29x10x15

The car has been run a good bit and seems to be a 7.15 car with what I have. I have a few options, so I wanted to see what you think.

I have a set of Edelbrock E-Street Heads, closed chambered 75cc that I was putting on another car. These would save some weight, and I would have to go to the 2" headers. Would these heads & bigger headers get me to 6.9-7.0, or do I need to do something different?

I am also considering going to Hoosier radials instead of my current bias tires. Anyone make this swap pick up any ET?

I also have a .456 gear spool I could slide in vs. the .488.

Any other suggestions on how to get a quick and easy 20-25 HP?