I bought my kit from PY and it hasn't gone well at all! I found out that I am the first guy to buy a kit for a Pontiac and as they are finding out from me, that Chvelles and GTO/Lemans are not the same! I have been working with them on straightening out the bugs, but sure has taken alot of time! I bought the kit because it claims to work with 14" wheels, but it does not.
I had to sent several parts back to them to get correct parts, and the caliper brakets still hit the wheels. I'm still waiting on the brake line that goes from the P-valve to the rear brake line. I've talked with several guys that have used other brake manufactures and they have had issues with each kit they bought. So be prepared to make lots of phone calls! The Right Stuff, which is the PY kit, does have great customer service, I'll give them that! So to rain on your parade, go to 15" wheels as well! You will end up there anyways.