Looking for some help, since I'm obviously an idiot

[BIG CTY]

In case you want to read about my lack of mental acumen...

So I've decided (I think) to go with 2" drop coil springs all the way around on my 66 SWB. Pics are in the link above. I went out and measured and I think 2" is what I'm looking for. NOW my question is this....I'm ASSuming that a 2" drop is NEVER really 2", I'm thinking it's between 2-2.5, maybe even up to 3". I lowered a Honda Accord a LONG time ago and I recall the drop being (IMO) significantly more than what I was expecting, and what the springs suggested. Somehow I doubt that a 2" drop coil would drop my truck LESS than two inches. Is my thinking flawed?

I'd hate to get 3" drop springs and feel like it's TOO low for my tastes. I do NOT want my truck lowered more than 3" ~2.5 is exactly what I'm after. Whaddya think?