Help Gathering Info on Inherited Motor

If you need to "dull it down" that will be a two parter; first the cam has got to go; it's really way to big for a streeter, But then youwill have to simultaneously lower the compression, which in your case is just a matter of milling the pistons down.
But,
If that engine has alloy heads just go out and stand on it lol. Ok wait, first you gotta do a few roll-ons to make sure it doesn't make the death-rattle.

If you can do a compression test, that will tell a lot about the combo.