Im not specifically against over clocking but i advise caution doing so as it generates so much more heat and can lead to early failure of your cpu.
depending on the need for processing speed a lot more can be accomplished with the use of smp configurations. (multiple nodes linked and running smp software) are quite fast even on cat 5 and sheer lightning on fibre network
if you do overclock make absolutely sure your cooling is sufficient to handle the job.
I wont advertise any specific water cooling system as there are many out there. but an on screen temperature monitor is a must.
positive pressure ventilation can keep dust levels down providing intakes are filtered and filters cleaned frequently and regularly.
you can control individual case fans using relays and a programmed arduino or raspberry pi. to run as needed when temperature rises beyond certain levels.
so you can experiment as much as you like.
you should also consider that cpu’s and components today use so much smaller amounts of materials that they are not as robust os the older equipment was and much less forgiving.