1994 Ford Explorer Coolant Leak

Engine Cooling problem
1994 Ford Explorer 6 cyl Automatic 145481 miles

vehicle has developed a substantial coolant leak at what appears to be the lower intake manifold/left cylinder head joint. Had an overheat due to a stuck thermostat ~ 1 yr ago. Thermostat replaced and no apparent leaks until very recently. Suspect some warpage of aluminum lower manifold but have not yet removed it. Questions are; 1) if warpage has occurred will a fresh gasket set suffice, 2) can manifold faces be resurfaced or is a replacement the only option and 3) has anyone had experience with this particular problem.

Thanks!