I have a 383 that's .060 over. I threw it together with crap laying around the shop hoping it would stay together for a couple years.Dingle ball hone,crap cast rings,knurled guides, 484/284 Mopar cam. Beat that thing for almost 20 years...lol. Didn't make a ton of power but never even flinched. Ran till the day I pulled it out. Still sitting in my back garage.