Dear Walt, Buicknut65, Chuck, and mid-60s Buick caregivers,
I'm told that when disc brakes were added in production that they too moved the front wheels outboard by about that same 5/8". My restoration is all torn down, so no opportunity to check it. I'll take a look at the 14s on my red convertible and see what I can learn.
My trusty wagon got a front disc brake conversion from
SSBC back in 2010 when I was simply trying to get her safe after years of neglect. I don't remember the model, but I don't think that changed the location of the front wheels.
Alas,
da' fellers at Orinda Motors didn't tell me back in 2010 that what I -
really - wanted was a Buick big-block, TH200-4R, Vintage Air,
etc., etc., etc., and . . . in particular 15" rally wheels. As a result, the front brakes aren't taking advantage of the extra radius that the 15" wheels will provide. So some
"adjustments" will be required.
Still, unless you want a really original car, this may be a place where aftermarket solution is worth it. Losing 5/8" of clearance could really hurt.
Cheers, Edouard