Whats years are best for LA 360's

I prefer magnum blocks. You get a factory roller setup. If you do some digging you can find some that have LA head oiling provisions from the factory. I have heard some claim that early LA blocks have more meat in them but I've also seen multiple engine shops provide sonic checked data that says none are thicker than the other. However, magnum blocks are a lot less susceptible to core shift. This can be more important if you're trying to build with precision.