Keep us posted on your progress, it would be interesting to know what numbers you are getting.
At this time I am running two turbos on my 318 truck and I can tell you that it is holding up the 500+ HP and I'm only at 8 pounds of boost. Bottom end is stock but I am running a bigger cam and same as you 302 heads with 360 valves but I've done quite a bit of Port work oh yeah and I'm running dual quad throttle bodies on a tunnel ram.
I have no intentions of pushing my luck with it though, until my new motor is ready to go in.