EAS 3.6.1 with jdk 1.3.x/1.4.x

Hi, Experts !

Has anyone tried using JDK 1.3.x/JDK 1.4.x with EAS 3.6.1( C5 )?
If so, have you found any problems. etc...
Can you share your experience?
I am interested in using it and see with better JVM and JVM options what 
difference will it make in performance.

I may NOT care about 'certified for JDK 1.x.'only.
Thanks
Hemant

NB: We have EAS 4.1.3, but our components ( CORBA components ) were 
developed using OLD powerJ( 3.5/3.6.1) version.When I use PowerJ 4.1 to 
deploy Jaguar components, it fails after compilation stating that
it is not an EJB component. Technical Support didn't helped much.

Thanks
Hemant