I installed a similar set of caps on a 440. I taught at a tech school, and the machine shop did the work so cost was not an issue. But after three seasons of running pulled it apart to freshen, and it had cracks between the cam journal and the no. 2 main bearing web. Over the years, I did all the normal stuff, block filling, different main caps, girdles, etc. As many have said, if you are building anything much over 600hp, get an after market block, at least they are making them again.