65, dual pattern cams aren't necessarily better than single pattern cams but at the same time they aren't necessarily worse either. I remember reading an article, possibly by David Reher of Reher-Morisson, that said dual pattern cams were originally developed for cylinder heads that tended to have weak exhaust ports. The added lift and duration on the exhaust side helped the engine make better use of the "restricted" exhaust port. In heads with a good Intake to Exhaust ratio the added lift and duration on the exhaust side may make little or no difference at all. Does that make sense? I am sure somebody will correct me if I'm wrong or help expand upon this. I wish I could remember where I read this, if I find the article I'll share it with you.
You can browse these though, there's a lot of good stuff here: http://www.rehermorrison.com/
Go to the "Tech Talk" link and browse the articles. Good info.