It works well in my 455, decent idle vacuum, 14-15 Hg and great low end and mid range torque, pulls hard to 5500 RPM, nice sound at idle. It was in my car when I bought it, if I was going to install one again I would defiantly go with a roller hydro.
http://www.compcams.com/Company/CC/c...csid=1203&sb=2