Remember Pete - the egr on efi cars does not inject exhaust gas at wide open throttle. For max power/torque you want to maximize oxygen/fuel in the chamber. The benefits of egr (reduced emissions/increased fuel mileage) come from being able to tolerate a leaner fuel mixture at part throttle/light load/cruise conditions. With a carb - I wouldn't bother. Back in the 70/early 80's before domestic cars were injected in a big way, egr with carbs didn't work very well. Trying to control the amount and timing of the injection, reduction of fuel introduced, and increasing timing advance with only a vacuum signal and a carb just doesn't work very well.
Sounds like you've done a great job making the car pass even if it's not emissions legal. Shoot for a cold air intake - it'll make the engine more efficient, and allow you to run more timing/less octane with less chance of detonation.
Sounds like you've done a great job making the car pass even if it's not emissions legal. Shoot for a cold air intake - it'll make the engine more efficient, and allow you to run more timing/less octane with less chance of detonation.