New to the C10 game, need advice on a rear drop

[Poop du Jour]

Just picked up a 78 C15 and I'm itching to drop it on its face but I see that the previous owner removed all but 4 leaves from the rear spring pack. It's also still above the axle. The goal for this is to keep it super cheap and ride it dirty so my question is this: flip kit or drop shackles?

5-6" further drop seems like it might be too low but 2" might not be enough. Front coils will get cut down too. It needs to be as low as possible, I don't care about ride quality.

Thanks y'all!