Did you get the lower arms as well? You're going to want those, at least at some point. The SPC arms will allow you to reach 5+ degrees of positive caster just in the uppers, but that's going to put the wheel pretty far aft in the wheel well and if you're running a wide tire, you may end up with some inner fender well scrub.
The lower arms are going to add 2* of positive caster inherently, by moving the ball join forward. This re-centers the spindle in the wheel well and allows you to run the caster you need without going crazy on the upper arms. So that's a highly recommended purchase and probably one I'd try to do direct through SPC, or have them give you the name of a company that's gonna actually get you the parts.
If you can't do those right away I'd keep your positive caster at or a bit below 3* initially. Then re-align when you can get the lowers in.
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-Jason
1969 Pontiac Firebird
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