The Integra knuckles supposedly make your caster go negative... meaning it leans forward rather than back. That's not good. I'm not going to find out though, since I'm upgrading my CRX with all 1990 CRX Si parts.
Jamie- you don't need the Integra master cylinder, but it does help. You can't use the Integra unit unless you swap the booster though, since the bolt pattern is different between master cylinder and booster module. You have to use the master cylinder from a 90-91 Civic EX. It will bolt up to the stock booster housing.