Found a 360 today

I found a complete 360 with a 904 on Craigslist and bought both today for $180. Couldn't pass them up! The 360 has a date casting of 12-7-70 so I think it must be a 71. I plan to pull a head first thing in the am to see if it's std bore(hope hope hope). Can the early blocks take 060 overbore if it's already been 030?