I recently installed a new water pump on my car, along with a new harmonic balancer. After doing a compression test, we found out my head has a crack in it!!! I am wondering, should I get new heads or port/polish my stock one's? I am not looking to go full race on this car, but I also don't want stock performance. I am just looking for a little extra "umph". Suggestions??? I was looking at either AFR's or Edelbrock's...or keeping stock heads...