Which year or years 360 is best

i would go with as early as possible (ESPECIALLY if you plan on building a 408). the 360 was introduced in 1971 and up until about 73/74, the blocks were very strong and thick. They started using penny saving and weight saving techniques that really compromised the integrity when turning this 35+ year old iron into a high compression long stroke motor. Just my opinion, i have a 71' 360 block thats going to be a 408...someday! haha

I got 2 360 engines with my 68 fish. One is just the short block and the casting says it is a -1 and the date is 6-71 although the 71 looks a lot like a 77 but they had a different casting number in 77. Hopefully the -1 block is still good enough to make a stroker and it is still 4.00 bore!