Probably overkill, I used Lucas 30 weight break in oil and a shot of Comp Cams additive on my 327 run in. Ensure it will start (keep the no start cranking to a minimum), pre prime, 2200 or so RPM for 20 minutes.

So far it seems the cam and lifters broke in just fine. No noise, oil is clean. I know it was expensive to do it with these products, but it is better to be safe than sorry.

Any good Carquest might even have these items in stock, mine did. If not they can certainly get them.

see2xu wrote:

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I had a 360 AMC built to 400+ hp a few years back, with flat tappets, and this stuff was strongly recommended by the engine builder:

penngrade1.com/products/high-performance-oils/penngrade-1-break-in-oil-sae-30/

Not necessary if you've put roller rockers in the 327. They told me that lots of zinc is helpful when the overhead is being pushed pretty hard by the combustion process.

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 Not roller rockers rather roller lifters. Zinc is required to protect flat tappet lifters.

I use GM EOS with every change on the old cars. No zinc required if engine has roller lifters.

Strange as it sounds, I think these break in oils are actually formulated to allow the rings to seat quicker. New modern everyday oils are actually too "anti wear" to allow that to happen in a reasonable time.