I would be more worried about the length of time that a head gasket has been left on your Jimmy. I take the gasket off my Jimmy right after I'm done using it. 16 years is a long time.
The head has to be removed on the 1993 Roadmaster to get to the gasket. You will need to remove the intake, exhaust manifold, and valve cover then unbolt the head to remove it. Check the head for warpage while it is removed.
take off the head, replace gasket. reinstall head
what is the preceger for replacing the head gaskets on a 1993 chevy suburban 4x4 350
Replacing the head gasket on any vehicle is a long and complicated process, however if you wish to see basic step-by-step instructions go to the related question on the right side of the page "How do you replace a head gasket?"
replace head gasket
Remove head change gasket and replace head, pretty simple.
What is the cost to replace the head gasket on a Mazda MPV?
cost to replace a head gasket
It is not possible to repair the actual head gasket. Repair of a blown head gasket is to replace the gasket.
remove head and replace gasket :)
The Intake gasket is leaking, NOT THE HEAD GASKET. Replace the intake gasket
You do not repair a head gasket you replace it with a new gasket which requires removing the head.