My last C10 I installed a 9inch ford with the factory leaf springs. Used lowering blocks with springs relocated under axle housing and lower spring plates/shock mounts from speedway motors. I made a upper shock mount crossmember out of 2" angle iron and the shocks mounted inboard angled in at the top. Same as under a dodge pickup. Shocks were same factory c10 only nitro drop. Worked great for 10 years and 50k miles. No problems.

Now I have 4 bar on air bags with both shocks behind axle angled toward rear.
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This is another setup I ran with a step notch that was mounted between spring and outboard frame. Also worked fine.