[jhv48]

You'll be sorry. Vacuum secondary carbs are made for heavier cars. Not ours.

You're going to lose power and throttle response. I've had two cobras that originally came with vacuum secondary carbs. One was an edelbrock, the other a Holley street avenger. Swapped them both out for mechanical secondary carbs. Both engines woke up.

Have your car tuned by a pro first before you assume it is the carb. Then, if the carb is the problem, either fix or replace it.

Swapping for an Ed carb will present you with a bunch of new problems.