Years ago, I ran a .030 over 454 with a cast crank in my 2700lb Monte Carlo with the cast iron heads. It had the 11:1 TRW closed chamber pistons and the 840 rectangular port heads, but by the time I had smoothed the domes and unshrouded the valves the compression was actually only 10.5:1. I did run the race fuel and never tried pump gas, but looks like I could have. I ran a Crane solid roller with .708"/.708" lift and the duration was about 262/272 on a 106 c/l. I did run a Weiand tunnel ram with 2-750dp and it ran a best of 9.53 @ 143, which was about 6.10 @ 115 in the 1/8th. I shifted it at 7000 and ran it for 2 seasons without problems, until the camshaft dowel pin broke and fell into the Cloyes double roller. Ouch!
I agree that your camshaft is too big for your combination and a smaller one would probably make it run stronger. Also, your 950 carburetor is too small (they actually only flow about 790cfm, because it is a 750 throttle body on a 850 baseplate) and I would change it to at least a 850 and a 1000cfm would be better.
I also think that you will be in the mid 6's, when you get the bugs worked out.
Bill Mitchell