Edelbrock Rpm heads on 360

The manifolds have more back pressure, so a less efficient exhaust, so a bit more residual combusted gases in the chambers, so that might help slow combustion and keep pressures down.

As mentioned above, a thicker head gasket (Felpro 8553PT), retarding the cam timing, a step larger cam, and keeping the ignition timing not too aggressive are your 'fallbacks' if you run into any hints of pinging or detonation. You're in a workable range.