87 SWB lowering advice

[JAG66]

Just picked up a one owner, low mile, garage kept, stock 87 black Silverado SWB. It sits like an old farmers truck. I'm researching lowering options. This will be a daily driver. The most I've ever lowered a square body is 2/4 with spindles, shackles/hangers/leaf spring removal. Want lower than 2/4 this time. Truck will remain stock body, mouldings, emblems, interior, etc.
Here's my want's:
To run stock tires and wheels (with option to run 18's? in the future) if 18's offer good tire selection.
No notching frame or bed supports. Don't want to compromise trucks originality.
Want to close up wheel well opening, but keep nice ride since daily driver.
I like drop spindles/drop coils/flip kit idea.
Noticed spindles come in 2", 2.5", 3" drops. Advice?
Thinking 3/5, 4/6, 5/6.
How low is feasible for DD?
Best place to purchase turn-key kit?
Opinions on shorter shocks or shock extenders?
One concern I have is driveline vibration due to pinion angles. I chased this with my 2/4 drop.
Any advice on kits and pics welcome to help me decide.
Jeff