I bought and installed one on my 87 Regal project. I have not been able to put it to use quite yet :-( but it fit perfectly and was not overly expensive imo even with the wilwood kit. I went with the big Ford ends. Qp customer service was very helpful and knowledgeable.
I would definitely buy again and highly recommend the company.
Only suggestion is to make your brake selection and stick with it. I decided to go with Wilwood instead of a qp disc option after I received it thinking I could just save up $$ and easily swap. Wrong that resulted in axel flange clearance issues and required me to ship back and wait for retooling. Also my brake kit cost over $800 from summit, but if you select the option in rear end package the Wildwood 7140 is a $500 add on with parking brake. So it cost me $300 and two weeks time. Live and learn.