1966 5.9 magnum cuda race car

If I swap to the later model control arms will that mess up my suspension geometry or are they pretty much just a bolt in application. I’m pretty sure the later style control arms utilize a b body ball joint. I’ve heard the sell a sleeve to slip over your early a body balljoint to make it fit the spindle. Is that what you’re referencing?
no, the arms are a direct bolt in.

correct, the later arms utilize the larger joint that is more common and used in a variety of applications.

yes, that is the a-dapt-or i'm referring to.