Wilwood conversion problem

The Wilwood kit you listed shows the minimum wheel diameter as 14".

http://www.wilwood.com/BrakeKits/BrakeKitsProdFront.aspx?itemno=140-11023

But that being said, they always throw in the disclaimer that the number they list is the minimum, and that not all wheels of that size will fit. If I'm not mistaken folks have had issues with the Rallye's clearing before, even when other 14" rims fit.

That kit also increases the track width by .20" already, so a spacer really isn't likely to work. Sounds to me like you're probably going to need a set of aftermarket 15" Rallye's that were intended for disk cars, and you'll want to check the center bore before you order anything.

As far as the drums, you should measure the inside of the drum across the diameter, that will tell you what you have. I do believe there are V8 cars out there with 9" brakes, but it would have been dependent on year and model. And of course, this late in the game who knows.