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It'll probably be in the same range as having your head gaskets changed, with the exception of an hour or two of labor to make adjustments and a little fine tuning.. I'd do it for $550.00.
And I don't know much about your rig, so it may be higher, may be lower. Get back to us, thanks... Good luck....
See...my rear intake gasket leaks as do my valve covers AND I need a new waterpump so I may as well fix my leaks, swap the heads, install some roller rockers, and toss in a mild cam while its all apart.