which year best 360 to start with?

I have been holding onto a 1972 360 block for over 15 years for a someday project. So you guys are saying that i bought into a myth about thicker cylinder walls, and have really been holding on to this for no good reason but to just watch it take up shop space? That really blows if that is true because i have had several chances to sell it over the years. Oh well seems to be the story of my life, holding on to something that i think is special and find out that i have something that is as common as, a or not any better than any other! Unfortunatly thanks for the info.