I have a mopar elec distributor with green spring (with small dia wire)
and a red-brown one made from larger dia wire.

I am recurving it to have 7 degrees mechanical advance.

Is the green one light/lighter/lightest?
Red one heavy/heavier/etc?
Is there a color code?

If these turn out not to be suitable, where do I get a kit with an assortment of tensions?