360 Magnum building on an existing bottom end

JoePole1 said

With closed chamber heads and flat tops you should be around 9.2:1 using the .028 head gasket. That's what I did. But..... If you are going to balance the rotating assembly you may want to go with something other than flat tops to boost the compression.

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Depends on if the flat-tops he's referring to are zero-deck or not. Factory Magnum pistons have a shallow dish but also sit .050" below deck at TDC. I ended up around 9:1 with open-chamber LA Edelbrocks, .027" head gaskets and factory pistons on my 5.9L.