sitting

I'm leaving for second semester of college and won't be taking my 67 mustang with me. Should I use some sort of fuel additive since she'll be sitting for up to two months before driving again. If so what are some recommended fuel additives? Any other tips on what to do to prepare the mustang...

Sorry if this question is asked often i just don't have the time right at the moment to look for it. I am working a 93 mustang that has been sitting for a while and i wanted to know, since it still runs strong, should i let it sit and run for a while to let the computer recalibrate itself or...