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So the 90 lbs is per reccommendation for that engine (just double checking)
truck had prior blown head gasket, so I'm thinkig it was torqued wrong by previous owner.
Yes, 90 lbs. is the correct head bolt torque for 360ci 1968-1977.
See: http://olybrake.com/pdf/fel_pro_torque_specs_guide.pdf page 25.