I'm assuming your looking down at the arm from the top. Pulling the arm forward will only help. It will create additional positive caster. On a Mopar drag car there is never enough. I did the math this way. 3.14 x distance between upper & lower balljoints. Divide this number by 360. example: My B-Body spindle diminsion is approx 8.5" 8.5 x 3.14 / 360 = .074" Pulling the arm forward .074" should increase caster 1 Degree. Since the strut rod is at an angle it will have to be shorter than .074 per degree. My bet is make it .200" shorter.
Doug