[GMC69]

I need input. I have a 69 GMC fleetside LWB with the coil suspension. I want to drop the rear 4". I was talking to one person and he was saying that 4" is too much to drop with coils, there is not enough suspension travel left. He said that the best combo is 3" springs and 1" blocks. Does anybody here agree disagree???

I need to find out ASAP so I can finally start on the stance of the truck.