Don't know BBCs, but that duration is close to mine. Since you only have RPM heads, nothing too big, I don't see a reson to go crazy with the cam. You may just be giving up low end power for high rpm power that you'll just never see if you're not spending most of your time in the 7-8K range.
If you want to do it right, have that head ported and then go with a bigger cam to match. I can shoot you a desktop dyno program if you want to play around, it's helpful if you can find the flow figures for those heads at different lift points.
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