Hi I would like to know if I could run BDI-4.08 on Fedora 3 ?

BDI comes with "Linux Inside". You can install it on a brand new HD, or if there is a system on it already, it offers to replace it.

As far as I have been able to figure out you have to compile from sources if you want to install EMC on an existing Linux system. You should check that your kernel can be recompiled with the realtime patches first.