Cam question...

I bought an engine on a handshake. The seller seemed genuine and trustworthy..."seemed". Doesn't always work out, but you can get a feel for a person...instinct, etc...
Now, this was not a high dollar purchase, so going on instinct is a lot easier and less risky, of course.
But then again, money is money.
I was told it ran, but pulled due to seller finding the engine they were looking for. It's a 1971 318. It has been worked over. "J" heads, double roller chain and through a borescope, I could see the .040 stamped pistons. My real question is, if someone does this kind of build, is it possible a stock, or close to stock cam was used..? Are most going to go with something pretty beefy..?
Just looking for opinions on what you've done or would do and the probability on what the cam may be.
I guess there's no easy way to know what's in there without removing the water pump and timing cover, right..?