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I would check with the people at QA1.net. I installed there front and rear system on my 69 C/10. They know there spring rates and are more than willing to talk to you about what you want. You can buy the systems thru Jegs or Summit cheaper than from them, I used my stock trailing arms with no C=notch. I also installed the Wilwood dropped front spindles with there front 4 piston disc brake kit. Wilwood also has the rear disc brake system with Emergency drakes also.

Wally