More AVO spring questions

[80Sprint]

I have some AVO's on order and will work on the back first. I want the car sitting reasonably low with no more than a flat hand between the wheel and arch, even less if i can.
Are 10 inch AVO springs the best size to give me a mid range adjustment, i don't want to be at the max top or bottom adjustment. I was looking at 160lb but only available in 9in and not 10. I can go 150 or 170lb in 10 inch.