How do I measured for front shocks?

[WOLFMANmike]

Hey guys I got a 65 c10 the PO put in lowering Springs or cut stock ones to drop it ... is there any way at all without taking out the coil springs out to figure out the right size as in length shocks I need to buy? Also I don't know if it's important or not but I put on those CPP front shock relocation brackets . I really would prefer to not have to pull the coil springs out . My front shocks are toast and I just did new front end rebuild ... new tie rods.. adjusters ...ball joints up and lower and new idler arm and pitman arm ... now the shocks are needed