Plug gap with Edelbrock heads.

What gap you think I should use with what's in my sig. I was running Autolite 3924's but bought a set of 3923's. The 24's were a little hot.I am hopeing to help my pinging alittle with the colder plug.My compression is around 10 1/2 to 11:1. I allready run 93 octane and can just run 12* of timing.
Thanks,Phil.

Thanks. No i have stock ignition.