I just finished a 429 rebuild and used PAW in Ca. for the motor parts and motor mounts and headers. I used Hooker Headers $329 about. Email me if you want the Phone number. They charge for the catalog but well worth the $8 You can dream all day with the catalog.
I bought a $175 set of headers, they would not fit. After the rebuild I did with conversion motor mounts the headers would not fit. They are now eye candy behind the garage. The hookers drop down below the front crossmember on the tranny. They worked too well. just my 2 cents.