Hi guys, I am the owner of the other running aluminum Ritter block. At this point I would do it all over again, the problems with the Aluminum block are not that bad, the only major problem is the lifter location in the block, that angle is real close to right but the location front to back needs some work. I have spoke with Kent on all of the problems I had with this block and he has fixed some of the problems and is working on others. This is the link to 420 CID build.https://board.moparts.org/ubbthreads/ubbthreads.php/topics/2041607/1.html