Best lowering suspension advice NEEDED

[Propureplaya]

So I am new to the forum and have started to restore a 1981 c10 shortbed. I already did a quick drop to the truck by cutting a full coil out of the front spring and a different bracket in the rear.

What I would like to know:

1.What is the lowest static drop that I can accomplish without tubbing out the front or rear? Keep in mind that I would like to run a 10" rear rim and a 8" front rim on 20" rims.
2. Do I need to purchase a negative offset on the rims?
3. What's the best solution overall i.e. 3" spindles with 2" drop springs, axle flip kit etc..

All this in mind I eventually plan on bagging the truck...so am I wasting my time and money trying to lower the truck instaed of just bagging it?

I'm reaching out to you guys because it seems that there are so many different ways to accomplish this but I want to know which way is the best/correct way. Any input is greatly appreciated.