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A lot of things are going to change as you add weight to the car.

Just tighten your u bolts down so they hold the spring pads tight.

One of the last things you do after you add all the fluids, after firing the engine. Even after a short trip around the yard is finalize the pinion angle by welding the spring pads.

Set your pinion angle close for now so you can do clearence test (jumping on the rear bumper etc).

On the spring sliders you need to guess a bit on your final weight and how your suspension is going to react. Generally if you set the bolt 1/4 the way through travel with just the frame then once you get the weight on(at rest) the bolt will end up around 1/2 way in travel and when you hit the throttle the bolt will slide back to 3/4 or 7/8 the the way back.
You can check unloaded travel by lifting the frame letting the axle/tires(or simulated tires) pull the leafs down to make sure your not coming off the front of the slider. 1/4 at rest is usually just about right for just a frame as a general rule.

Just tighten down your U bolts and tack/bolt your sliders for now getting your pinion close.
 

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Also at this stage if you plan on running a traction aid like assassins or caltracs make sure you leave yourself enough ground clearence under the front of the leaf to keep the setup above the tires sidewall.
 
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