Performance timing

Yep the distributor is in the 318 in my D150 truck. It has a smooth idle in park and in drive . It idles in park at 1000 rpm And in drive at 650 rpm . I have a 600 cfm edelbrock carb on the motor. It used to fry the tires with the worn out 360 it had when power breaking it but it had walmart wranglers A/t now it has highperformance street tires from big O now it just axles winds or wheel hopes? Im planning on getting rid of the thin 4 leaf springs and swapping to 3/4 ton thick 6 leaf springs