Its always advisable to upgrade to 3.1, just for the advantages of Workbench 3.1 also its cheap to do. I cant say for sure but it may help with compatability with WHDLoad and its installers.
I have a question, a couple of people have mentioned the 8MEG fast ram upgrade but Ive not been able to find one? The site
http://a608-amiga.co.uk/ hasnt been update for an age and if the new batch is being worked on still it must be a slow process. Does anyone know where thay are availible from?