When we jacked up the camaro to put on the Alston clip I watched the bumper rise before the rest of the car, yeah that attachment point for a unibody isn't much and if your rails are rusted that pocket holding those cage nuts and the cage nuts themselves are something I wouldn't risk, lets just say I am not a fan here, and the bunper was attached to those frame rails which clearly was rusted away from everything else. Yes aftermarket tubular arms, a new brake kit, new steering etc, you might as well weigh doing the swap, thats why we went Heidts on a '65 mustang its actually cheaper! They do make two different aftermarket a arms, the narrow, that uses the strut rod and the wide that eliminate it. I would recommend reading some suspension books, great reading and understanding why the parts are used, and what not to purchase, and yes the geometry must be right, if it is in every case so far I have done it was a huge improvement, thus the reason they are making so many of these kits, ask anybody who has used one of the reputable ones. If you want to use Checkered Flag, ask for refrences from somebody that installed one and has actually used it and see what they say, my speculation on something I know nothing about might not be a great idea to listen to. This company could be the next great kit who is selling reasonable to get a niche in the market place, clearly I have know idea, I won't bad mouth something I don't know about but can vouch that Heidts and Alston are nice additions. Homework time, your doing that and won't regret it that way later best of luck Matt