64 273 new rebuild now with coolant in #6 (It's a Hybrid!)

I got this motor with my 64 vert, it was rebuilt and sitting on the stand when I got it. I swapped to a D4B intake. I broke the motor in and have been working on it and firing it up and running it hear and there to warm it up and get a few heat cycles to cure exhaust paint etc and it had ran great. Then it started blowing white smoke on the right side, car never overheated. I let it cool, the when the radiator was lightly warm to the touch, I slowly popped the cap off and there was a bunch of pressure and my coolant level was no where to be seen. I took the spark plug out of the right side and saw coolant in #6. I stuck a shop vac over the hole to suck the coolant I could see out (it was at TDC) and did the other cylinders too just in case. I could hear the vacuum bearing down on the other cylinders, but not so much on #6. I pulled the intake and the right side head and cannot see any obvious blown head gasket. The head bolts all felt good when I broke them loose to remove the head. Do I get another felpro gasket and hope for the best? You can see where they used copper spray, could that be a factor and should not have been used with the 8553 gaskets? Should I re-do both side and use a Felpro 1008 gasket or find NOS gaskets?
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