I used Mile Lewis for the rotating assembly in my 496, gosh probably 10 years ago, and everything was absolutely top notch. huge thumbs-up for Lewis Racing Engines.
FWIW, I'm having a hard time believing the OP scored a virgin, standard bore 454 block for $50.
Block was a 289 2 bolt main bored .40 over already. Come to find out it’s missing the main caps. When i took it to the machine shop the machinist told me I would have a lot of money in that block.