2WD lowered to lift questions

[Desperado]

Hi guys I have a 1990 GMC C1500, My truck was lowered before I bought it. I don't understand the process very much and I have a couple of questions.
My end game is to get the truck back to stock and then lift it 4 inches.

My first question is how is the rear lowered in my attached photo.
As far as I can tell it seems the person has put the axle over the top of the leafs and notched the chassis to allow for travel.
Have any leafs been removed??

If I put the leafs over the top of the axle will that be stock and then ready for lifting blocks.

As for the front I assume someone has just put drop coils in. Is this correct?

Would I need to buy stock coils to suit the rough country 4 inch lift or could I possibly buy spacers to bring them back to stock height and then ready for the lift spindles.

(I know in the US it would be preferable to buy a K1500 but in Australia these trucks are still $25,000 so a lift is my only option for now)

Sorry these trucks are rare in Australia and its very hard to find info.

If I have put this in the wrong thread I am sorry.

Thanks

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[brianmcb]

That's a flip kit and it's a 6" drop. Looks like all the leafs are there.
The front most likely has drop springs and drop spindles for a total of 4 to 5" drop.

95 rcsb, L33 5.3, hot cam, frost tune, 5spd, 4/6