My ladder bars are older and only have 2 options in the front mount location. With a milder motor I had best results in the top location but upgraded the engine combo that has 200 more hp. Still working on the tuning things in but think maybe going to the top hole may be best. 3600 lb. 72 Firebird, 10.5W slicks, 4.56 with 2.20 first gear, transbrake. Input would be appreciated!