Question on repairs

I explained to him that I would check the car over and check everything and he argeed. The orginal job was -replace intake , replace engine wire harness , install internal style voltage regulator alterntor , carb with electric choke , new raditor , belts and hoses. Also to check brakes, rear axle ,transmission & clutch.
When I found the orginal raditor was like paper and filled with rusty water, I pressure checked the coolant system and found the freeze plugs leaking, I put the car on the lift to do them and I found the ones on side where under the exhaust manifolds and the ones in back of the heads could be seem and removed in the car. When the oil was drained to pull the engine, it smelled burnt and was like water I knew I had to pull the pan and if I did not I would have bought him a new engine..