Looks like you have the bolt-ons covered already. I'd definately suggest doing a roller cam swap then. You can use the roller hardware (spider, lifters, dogbones) from a 5.0 stang or mid/late 90's F-series pickup, and it's usually less than a 100 bucks. If your rig is still speed density then your cam choices are going to be a limited. A custom grind cam will take the guess work out of choosing an off-the-shelf cam, and it would be something you could sell later on when you plan on doing your next build.
What are you using/doing to tune your rig?