head gaskets can be replaced the the engine in situ. you will require the special tools that enable the timing chain and cover to stay in place, or if you like stripping nuts and bolts then remove exhaust and timing cover and chains!!!
handy enough job on the atmo if you know what you are about.
the head bolts are non strech type and are definatly ok to re-use at least once if the threads are in sound condition after a wee rub with the wire brush!
full head sets can be bought from engine reconditioners, check your yellow pages.
also you said that you priced one head gasket, hope you are not thinking about changing one???.......if so ignore all of the above and leave it to someone who is a mechanic
ship her over to belfast for competitive rates!!!