How many links for extended arms?

[Power225]

If I go 4 inches over stock what size chain do I need. What size chain would I need if I went 6 inches over? Thank you for your help. I'm trying to set my bike up for the track. The plan is to extend, lower, and go down one tooth in the front.

[chevelle]

with a 530 chain every 2 links add 5/8's of an inch