Interchangeability of suspension parts for 60's big cars
 

Can anyone point me to a thread or info related to the interchangeability of Pontiac or GM suspension components or more specifically A-arms and spindles for the 60's Bonneville's, Cats and GP's. I have a 62 Bonneville that I want to lower and convert to disk brake. The Scarebird stuff looks good for breaking but doesn't help with lowering. I was hoping to find alternatives to a full custom $u$pen$ion.