I am not familiar with Campbell. Sorry. I am however, very familiar with Rick at Cassel Enterprises. Rick is about as sharp a Hemi person as you will find. He made his living as a crew chief on some big name NHRA Top Fuel/Funny Cars. He know Hemis, period. I have bought many, many things from Rick with no issues. All orders were processed quickly and correctly the first time. Have you called Rick and spoke with him? If not, give him a call. His number is on the Cassel website. He does not mind talking with and helping you meet you Hemi goals..
P.S. Tell him Ken with the green '69 Hemi Barracuda sent ya....
Oldschool