Don’t confuse the initial installation torque specification with the required fastener tightness down the road. Just because they specified X ftlbs at installation does not mean that after several days or heat/cool cycles, that should be the torque on the fastener(s).
The installation torque required to properly compress a head gasket at installation should take into account the compressability of the gasket, elasticity of the fasteners and so on to ensure that as the assembly heats and cools, it maintains a seal. Re-torquing could actually cause problems in some cases. Unless it is specified, it’s probably best to leave it alone.
Checking torque after the initial application is nearly impossible anyway as it depends greatly on the breakaway force required to start the fastener moving again. This can either increase or decrease over time depending on circumstances (materials used, environmental conditions etc)