All 440 blocks are similar enough to not worry about differences. What a block needs to come with to be cost-effective to build are standard bore and main caps. With a sonic check to confirm enough cylinder wall you can go .060 with a 440, but it's still best to start standard, if possible (my son's tired 1970 440 is still standard bore, but my relatively fresh 1969 440 is .030 - but that was free).