Spark plug gap

The car ran low 8's in the 1/8th with 587 heads, and edelbrock performer and 700 holley. 3.55 gear. I have switched to a4.56 gear, W2 heads, holley strip dominator, and 750 holley. Just looking for a couple of tenths. I will hopefully have it to the track this weekend to see what the changes did.