I would do all the bushings at the same time, core support and body bushings. Use the search option and look for a detailed thread on the topic (there are several out there). Soak the bolts for a real long time before diving in. You will need to disconnect the steering column from the steering box to facilitate jacking the body off the frame. Not that hard of a job. Sounds hard but it really is not that bad.
Thanks for the info Larry. I did a quick search, saw some topics, but really didn't find a detailed thread (which given my lack of experience, I would need!). I'll keep looking.
I am quickly learning that things snowball when I start making improvements to my Bird. I started detailing the engine bay (removed pretty much removed everything but the engine) and figured after that after I finished I would tackle tweaking the alignment of the nose (which is why I want to replace the core support bushings). Of course now I am thinking that I hope it starts when I put everything back together again!