Scott, great info....can you post a pic?
BTW what is the correct numbers for a 428CJ car?
All the HD ones from the period look to carry the engineering number C9AF-11450-A. Know of three different versions/styles, likely due to different providers or running changes.
Don't forget to look for a good date code while your at it.
As a mention keep an eye out form broken ones (the divider between the posts often get broken) with good numbers and date codes - if your rebuilding one, Then get a newer model and swap bases when you have one rebuilt.
Just a thought - I stopped throwing the broken ones away for this reason