Thermostat Gasket on 2004 Ford Explorer Sport Trac

My car started to leak on my way home, I made it home and saw that water was leaking from the thermostat.. I replaced the thermo stat and seal, now the gasket inbetween the manifold and the houseing is spraying out coolant. The Gasket I guess has blown out and I was wondering How much the cost of repair for a new gasket would be?

Asked by for the 2004 Ford Explorer Sport Trac
Has the engine badly overheated I hope these leaks are not spurred on by a build up of pressure due to a failed head gasket introducing excess pressure into the cooling system.
To replace the intake manifold gasket is according to my labor guide is between 1.5 and 2.5 hours depending on ether you are replacing just the upper part of the gasket or both upper and lower intake manifold gasket , the gaskets are cheap (under $20 and $20 for coolant and recycling fees) .