I have a pair of HD 11'' shocks on the rear of my 72 CB750k2. About a 2'' drop from the stock 13'' shocks that were on their. I didn't feel like messing with lowering blocks. Pics of my bike are in my Gallery....
Their is a way to internally lower your front end. Their was a huge topic about it not too long ago in the Tech forum. It is basically cutting a desired amout off the spring, and adding it to the lower part of the leg, with a washer in-between the two. I plan to lower mine by 1'' to start - see how it rides - and go from there...
On an extreme case, such as with a 4-5'' drop, your front-end would look like the one on the bike below. This example is more for show than anything , but you get the basic idea I am sure....