I would retorque cold and not back them off. The idea being that you maintain a clamping force on both the head gasket and the figure 8 gaskets at the bottom of the cylinder liners
Just check your torque values- seem remember the given figure being about 105 ft lb - but would need to check.
Make sure you have the correct washers under the nuts.
Don't think the cylinder head studs are stretch bolts but they are cheap enough to replace as to matter of course in a build and if you were going for serious power you would use ARP hardware
Arwyn
