How you set them all depends on your spring rate and how stiffly damped you want it. Ideally the shocks and struts should damp the springs enough that the car does not bounce at all, but also not overdamp such that it gives a harsh ride and does not let the springs do their job.
I have my fronts set on 5 (350lb/in coilovers = >800lb/in in stock location) and my rears on 4.
If you have stock springs, 3 should work pretty well.
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2000GT Atlantic Blue: Cobra R Wheels-17x9 255/40/17, 17x10.5 315/35/17, tubular K-member & control arms, Tokico 5-ways, coil overs, sway bars, strut/shock tower bars, 70mm FMS throttle body, Saleen nose.
79 Pace Car: Maximum Motorsports suspension - H&R Race springs, Bilsteins, rear control arms, chassis bracing, Draglites, 302 w/ Edelbrock Performer intake, cam and 600cfm carb, BBK equal-lengths & H-pipe, 2.5" Flowmaster 2chmbr exhaust, Al Driveshaft, 8.8 trak-loc, TCI C4 w/ 2000 stall, B&M
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