fays watts installation

[camaro427-69]

i´m installing the fay´s watts link into my 69. the installation was really easy and straight forward but now i´m struggling with the adjustment. the guide says that the 2 bars running from the leaf spring and the axle tube should be parallel to the axle tubes. i already moved the pivot as far down as possible but still there´s about 1-1.5" missing on the leaf spring bar to get it parallel. what can i do about it? leave it like it is but the manual says they need to be parallel. should i get 2-3" drop leafs for the rear? or should i mount the watts bar lower (i pushed the bar as far up the rear frame till it got stopped from the floor and drilled the lower 4 holes at the mounting points so i can gain about 1" if i pull it and mount at the upper holes but that would mean that i have to slip it almost all the way off the frame so i think there would be a significant drop in stability).

any thoughts?
thanks,
pat