The factory specs were for bias ply's, and called for +.25° to +.75° for camber, and 0 to -1° of caster. So, positive camber and negative caster, which is basically the opposite of what you want with radials.
For radial tire alignments the SKOSH chart is a good resource.
View attachment 1715536535
I think the SKOSH chart is a little conservative on the amount of positive caster it calls for, personally I'd add +2° to its caster recommendations across the board. But it is an older chart and the parts needed to get more caster than it calls for weren't widely used at the time it was published. If you have stock UCA's with stock bushings it's unlikely you'll get to even +2° of caster. If you have stock UCA's and offset bushings then you might get to +3.5° caster. To add that much more than that you'd need tubular UCA's, which have additional caster built in to most of the designs. +5° is usually pretty easy to get with tubular UCA's. Positive caster also tends to make the steering a little heavier, the steering wants to resist change and the re-centering effect is magnified. Which is good, but if you have manual steering you may not want to just add a ton of positive caster as it will increase steering effort. Going past +5° caster on a manual steering car makes the steering effort noticeable heavier.
