It may be obvious but....
protective gloves are a good idea.
label everythng as you dismantle it (and photograph the process as well). Makes re-assembly MUCH easier when you know what goes where and can actually find it.
For some cheap extra power, a good free-flow exhaust/Manifold system is hard to beat. I had ine on my 1973 Triumph Dolomite (1850cc very compact car) and gained 10% power and an extra 6MPG _ 36, up from 30. Just from letting the engine breathe properly.