Should i have cooling or not?

[Neo]

A Pentium heatsink from an old PC will probably fit. Many 486 heatsinks will do, if a little bit small though.

If you have trouble fitting the heatsink over the CPU, then a Dremel might be usefull for cutting the heatsink. Just don't damage the surface that will be touching the CPU as it is important that the heatsink have full contact with the CPU, especially at the center, to function properly.

[Neo]

To fitt the heatsink to the CPU you will probably have to glue it. For that you need a heat conductive glue. As an alternativ to such glue is to use heat conductive paste and a small amount of epoxy to keep the heatsink in place. Don't let the paste and the epoxy to mix as it will get messy then.