I'm about to tear this motor out and then apart.  It's kind of hard to do because it runs pretty good today but I can't trust a 43 year old motor's stamina, so here I go.   I think updating this thread with the progression of the build will save my butt from mistakes with the help of the forum.      My plan is to remove the carbs first then the head and then block and transmission.  I know the basics, label and bag everything and clean, clean, clean.  I did my 280 a couple of years ago with step