Very widely acknowledged that Mopar blocks are much harder than normal Bowtie or Blue Oval blocks. You almost never see a major ridge in a high mileage Mopar block. I figure the main reason to bore a BB Mopar block is to get the bore as perfect as possible w/head plate & the exact bore size you want for the pistons. They don't wear like a Chev so you start in a better place. Again HP, HP2, low perf 440 blocks all the same IMHO, except the marine & industrial blocks, ('68 & later passenger car w/frost plug ribs are better than earlier, less like likely to crack between frost plugs).
