Lots of options...
Are you willing to buy new headers? If not you can check 440-1, Indy SR, Stage 6, Victors, and any of the B1 stuff.
You dont need a 350-360cc head for a 470 inch engine either.
The EZ is the makes the most sence. No new headers, and can support 800HP fully ported..
You can reuse your old rocker gear, and headers, and intake..
This isnt possible with the raised port stuff or max wedge port window.
I would just get a Indy EZ kit, have one of the board guys give it some good work, what they feel is needed for your hp goals...