Leaking Coolant
Very first thig I would do is take a good look at the back of the engine behind the intake where it meets the heads.
(might only be intake gaskets) but it's a little scary that it leaks without even any pressure on the cooling system yet.
The porting part is a little scary also (if he went into a cooling jacket)
Both of these could allow coolant into the block itself and come out the drain.