Finished up the dyno testing with the dual conical valve springs and got the article submitted to Hot Rod. The springs worked just fine even with a super aggressive QRI lobe on the cam. The intake lobe was .780 lift with the 1.65 rocker arms and the engine pulled nice and smooth up past 7000 rpm. I don't think I'd recommend that lobe for a bracket racer but it was interesting to run it as a test.

Here is the article: http://www.hotrod.com/articles/dyno-tested-dual-conical-valve-springs/