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So, you are saying that if you have a good positive caster the main requirement would be the toe-in adjustment. Installing a Borgeson conversion shouldn't change your caster. Is that right?
For normal driving, I like lots of caster. Others will probably have different opinions, esp. If AutoXing, or road racing.
While you should have your alignment checked after installing the Borgeson, the Borgeson itself shouldn't have any effect on your alignment settings. Since you have to play with the relay rod, and maybe remove the tie rods from it, you should for sure check the toe setting.