Good product, i use them, sure, some machining but it's nothing any reputable machine shop couldn't do. Square the block. Front, back, top, bottom, trim the caps, be sure the girdle is in place before align honing/boring the mains. Besides trimming the main caps it's all Stuff that all should be done anyway on a 50 year old FE that's gonna see any good amount of power.
JMO for what its worth.
Dam sure ain't gonna hurt anything.