I have installed Oracle 8.1.7 on Redhat 7.3 before and it is rather easy as long as you follow the guide closely. Just take note that you need to download the following extra files before you start running the Oracle Installer. Good Luck!

1. glibc-2.1.3-stubs.tar.gz (oracle patch)
2. jdk118_v3-glibc-2.1.3.tar.bz2