Adjustable Ride Height ?

[zuess4u]

67 Camaro high school project, we are currently starting on the sub frame, doing the Gulstrand Mod, and are going to run 600lbs springs up front. We like the idea of the landrum adjustable spring bucket, but still seems like a bunch of time to adjust the height. Has anyone used a screw or weight jack through the upper a- arm to make height adjustments easier? If so do you have pics? Or is there another, not so costly alternative. We want to be able to go out and do auto crosses and other events and then lower the car for shows and cruissing, any help appreciated.