Ah would you look at that! Mines a 99 Gen 1 with 40k too
And ive got the same (well used too)
As for the cam chain guide/chain i believe this can be a bit of a hefty job to change, so like alot of other Gen 1 owners out there, ive left it too - But might get it done for the sake of it this summer.
As for the noise - have you just had new pads put on the brakes? I have recently just changed the front pads, and the piston was sticking slightly, and for a week or so when i braked hard there was a bom bom bom bom bom, quite quick and relativly quiet (no juddering) when i accelerated again after braking hard - especially at about 60. This has now gone however - have you thought about cleaning up the calpiers?
Hope thats of some use