I lowered my 69 2.5/3. I didn't want it too low, but I did want better handling and the look of it being just a tad lower.
I did my at the same time as my disc brake conversion, so I was better able to justify the cost. By sticking with the stock springs up front I was able to help hold the cost down.
Handling is far superior to what one of these trucks drove like brand new. I have an access ramp that I use for a high speed corning test. I could go around it at 85 mph in my Bonneville, a vehicle that loves high speed corners. My 69 would be on the edge at 65, since the conversion she will hold the curve at 80 with ease.