Here is the ad
http://www.racingjunk.com/Heads/182747401/Dart-Pro1-355-Reher-Morrison-CNC-Cylinder-Heads-for-BBC.html
I dont see anything on the forum about him but there are red flags that would stop me
1. He has only been a member since 06/30/2016
2. Has no profile filled out
3.Has no buyer feedback
With that information and him giving you therunaround I would say "buyer beware"and maybe spend your money elsewhere