Jeez, I'd of just shipped you the engine.
You know I thought I remembered somebody doing an engine in cam swap on an ERA with an FE in it and talking about it here. I thought it might have even been Chas. But I did a pretty thorough search and can not find it. So, I may be mistaken on that. I still say pull the engine and work with it on a stand where you can sit on a comfy stool and take your time without feeling like you've been worked over the next day.