Timing Belt, Water Pump?

What do you change the Timing Belt and Water Pump on an Accord? I remember asking before, but I dont really remember. Is it something like 75k? I got 67k on my 1990 right now. Plus, when I was going to change the belt and pump, I was going to upgrade my pullies and cam gear also, is this a good idea? how much HP would I gain? Thanks!

Woah Na! My bad, I ment When, Not What (First word of previous post).

im not sure about changing the timing belt. but as for gains, probably not much. all the pulleys do it take power away from your powersteering and a/c. and the cams' gains are up to you. advancing or retarding will determine what gains and range.