Need help figuring out my engine size

Here’s my dilemma I can use some help on. I bought a 1968 XR7 a couple years back and need to know how to verify my engine size.

I’m don’t know if the engine in it is original to the car, or if it has been swapped out over the years.

I took it to a couple local shops and wasn’t able to get a clear answer. I was told I have a 302, and I was told I have a 351 Windsor.

Where on the engine can I look for the engine numbers to figure out what’s what?

Appreciate the help on this.

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Awesome…thanks Mike. That helped out a lot. Much appreciated.

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