Need some advice on slicks for my '67 Notch

Slicks cause the car to waddle, so I used the 7/16 spacer, they touched with the 5/16" spacer, but I was running a spool which causes the waddle on turns. You will need 5/8" min. space to the leaf with slicks using a posi. and more (3/4" to be really safe) with a spool, if using a 10"slick on 8" 4.5BS. wide rim.The test is when you see the marks on the inside of the slick, you go to a thicker spacer.