Big block rebuild - where do you buy your parts?

RustyRatRod said

And you somehow think the bores in a fifty plus year old engine have no taper and are not out of round? Why are you even on here asking for opinions if you're just going to do what you've already made up your mind to do? You're going to build an engine with nowhere near enough compression for the cam, plus one that has worn out bores. How long do you thin it will run "good"? Have fun!

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Rusty, all I really was asking was where do you guys buy parts now as opposed to decades ago . You guys have a wealth of knowledge that I'm actually thankful to hear. But. This is a temporary engine just so I can get some wheels rolling under my ***. Is this how I would want an engine built.. no. But that isn't the question.
Again, I honestly value everyone's input. It's just not where this " junkyard " engine is going. A sincere thanks.