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It'll depend on rust, really. It's been a long time since I worked on a 60 degree, but I think the manifold points down at really awkward angle almost necessitating getting at it from th bottom. Regardless, take a look at the back of the motor and see if you have any clearance from the top. When you're ready to take it apart, I'd let the engine run for a while and get warm, then shut it down, spray some Deep Creep on the threads, then attack it when it's cooled down.

there is also the possability that the flange on the downpipe is worn excessively and is part of the issue. Chances are a spring rusted/broke on the spring bolts or the donut is worn out. Won't really know till you get in there. Swivel sockets will be your best friend here.

Usual course of action is from under the car, acetylene for heat, impact gun with a very long extension and a deep socket/swivel on the end.

That gasket will be a *donut*, depending on when the last time the flange bolt/spring/nuts were undone will more than likely dictate how awkward the job will be.