Questions about lowering a 70 C10

[Jonny P]

This is my first project truck ever. I went into a local speed shop and asked for lowering springs that would get me 1 front 3 back or 2 front 4 back. When I got there I was happy to see that he ordered me hotchkis since I have read good things about them. When I got home I checked on the parts number and found that there are 4/6 drop. In the LMC catalog it states that 4 or more requires a frame notch and a which relocating kit. I don't see this on the hotchkis site and was wondering if anyone is able to point me in the right direction. Thank you for your time.
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