You can, but its way faster and easier on a machine. My friend had one.
OP, as long as full advance is in by convertor lockup...you're good....and hell, none here can tell you EXACTLY what curve you need and the rate of which it falls in.
I have friends that would remove the one stiff spring all together and only run the one factory soft spring to get 18 at idle and 35 full advance. Some run the mr.gasket one spring others both.... both for drag, one for street is what I adhere to.
