416 dyno tuning help

You definately need more timing and I think once you get that figured you can start really tuning the carb. There's more there, whether it's another 80-100hp is another question but IMO you're a little fat and it's short at least 8° of total timing. What head gasket was used? Were the pistons zero decked or down a little? The heads were set up by Mike and I have 100% faith in his abilities. But I'm assuming he did not assemble it. Did the assembler check the sweep pattern on the valve tip during assembly? There have been reports of rocker issues with those (and other) heads.