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It's advisable to change head bolts as they do stretch over time, so for the extra few bucks, it's a worthwhile investment.
Make sure you use a steel rule or a flat level bench and set your head on it to make sure it's 100% straight and not warped if you're not having it machined or reconditioned. Any warping makes it a waste of time replacing the gasket as it will happen again.
They're a big lump of a motor so make sure you use monotorque (ACL) or at the least EZY gaskets, they've both been around a long time and are good quality. I've seen a lot of cheap gaskets fail or have defects. I had to buy 3 sets of inlet manifold gaskets for my 351 2V before I got ones that would line up with the factory ones.
Apart from that, quality tools, patience and a clean work environment makes it easier. Read up on a manual first if you're not sure, or ask the Q's here, so you don't stuff something up.
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