OPG Coil Spring Options

I am planning on upgrading the suspension on my 78 GP with OPG lowering springs and Bilstein shocks. Based on inputs from others, I have narrowed my options down to a drop of 3/2 or 2/1 (F/R) My questions are:

1. Would it better to shoot for more drop and then shim (with Global West aluminum spacers) or less and trim as needed?
2. Minor trimming on the fronts is easy, but does anyone know if the rear OPG springs have pigtails on one end of both? Rear G-body springs seem to come in both versions from different vendors. I know my current Moog CC627 rears are only single pigtails.
3. My 78 GP has a Pontiac 400 w/ TH350. All of the OPG springs are based on car type (Monte, El Camino, Malibu, Wagon) and engine (V6, V8, and Monte SS). Does anybody have any idea what would be in the same ballpark? I was thinking the Monte V8 option would be closest since.

Far enough. I'm just looking to improve appearance and handling some. I was planning on running stock spindles.

The hard part now is determine an approximate target drop since "stock" is difficult to define. I've been reviewing a lot of info from different people to determine what different combinations of springs and shocks look/ride like. I don't have any hard target, I just don't want to end up havng to get multiple springs.

Is there any difference in fender clearance at full compression between the 3" springs and the 2" springs for tall ball joints?

Yes I've seen that before. My question isn't about which springs (Eibach\Moog\OPG). I know I want to go with either 3" OPG or 2" OPG with tall joints. My question is is the difference in the wheel to fender clearance impact when at full compression between these two options.

Just to clarify, I am basing my thoughts on springs based on the results a number of people have gotten on this forum. For example:

http://onfinite.com/libraries/1378271/07d.jpg
(Tony_SS's 78 Monte)

I am not looking for any specific amount of drop. Just the right appearance with decent handling for the street.