Lowering question on drop spindles

[sportfish69]

I have a 69 gmc step side and wart to lower it. I have front suspension from a 1991 suburban 5 lug and disc brakes. Looking to drop it 3-inches in the front and 4-inches in the back.
1 - Should I get 3-inch drop spindles or something less and use drop springs?
2 - Will a 3-inch drop affect steering or turning?
3 - can I use stock 15" wheels with the 3" drop?
4 - Anyone have an opinion on Crown or Spring Tech spindles?

I plan on using 4-inch drop springs on rear as I have trailing arms.

Any help is greatly appreciated as I am new at this. My 17 year old is driving me crazy to re-construct our project.
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