Raising the rear



I'm going for a late 70's street machine look, but don't want to result to shackles to fit my G50-14's. Even with the airshocks fully inflated, there still isn't enough height. The above pic is from the test fit last night, car is on the jack.

What springs would you recommend to get the rear up safely and soundly?
I thought about having the existing spring re-arched, but figuring they are the originals, it would be wise to replace them anyway (they sag a bit).

I came across these, but not sure if they will provide the lift: http://cgi.ebay.com/ebaymotors/REAR...dZp5197Q2em7QQitemZ350393724698#ht_1549wt_941

Thanks-