Actually Wayne that's now always true...
I got a no-name brand back in February of '01. Ordered it from JC Whitney. Anyway, came with coils, a short AAL, and a 1" block (Ugh!, replace that with a shackle!). Anyway, I got lucky and my sagging rear didn't start sagging fast. Right now if anything my rear is sitting higher than the front (and that's a recent development, before that it was level as you can be).
However...
In hind sight I say go with a long add-a-leaf. They're just a better way to go and they don't promote leaf sag nearly as much as the shorty's. Try to avoid a lifting block as much as you can out back, blocks are not friendly with leaf springs (extra leverage with axle wrap, turns spings into pretzils). Go with a longer shackle instead if you have to.
Sequoia