Break-In. How Long?

kbakewell said

I had my '65 273 professionally rebuilt at an engine shop, and they told me 1,000 miles before it's fully "broken in." I am sure you know this, but you also need to use something like Valvoline VR1 racing oil if you plan to run readily available premium unleaded. Love our '65!

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I started it the 1st time with a VP Racing Fuel called C-9 (Non Ethanol)
Then I started using a Recreational Pump Gas called Premium/Premium (Blue Handle) It's a 91octane Ethanol Free and I put some Lead Additive in it (1/2oz per Gal)
For Oil I run a Rotella T-4 15w40 with a zddp additive in it (1/2oz per qt I think)