Dan,
Nice haul. Yeah. they are marine engines. It looks like the one on the right side of your first photo is not drilled for a hydraulic cam. Is the other one the same? ( look down the lifter bores... if you don't see
oil holes on either side, they are solid cam blocks.) If those engines were mine, I would seriously look into getting them drilled. It may not be worth it in the end, But it is worth looking into.
Steve