http://www.baselinesuspensions.com/instant-center_general.php

I use this to figure my 4 link IC and AS settings.

A lot of variables go into what a car likes for a IC height and length.

Never 2 that are the same.

67 Barracuda street/bracket car 11.27-119
68 Dart 502 BB 8.70s-152
414 cid SB Dragster 7.65-174