I have a 1967 dart gt convertible and I am building a 340 for it. It is .30 over 10-1 pistons, J heads ported. Torker manifold, Holley 750. I need input on camshaft. Either hydraulic flat tapper or hydraulic roller. I would like a nasty idle but also run well between 2,000 to 6,000 rpm. It's a street car so I want it to be driveable. Suggestions?