im assuming the engine was running before you did the swap and not left set over the winter and thus froze and cracked a water passage
did you have the head checked before you put it on ?
when you tourqed the head down , did you follow the sugested patern ?
with that much water your dumping coolent strait to a oil passage and to the cylinders .
drain the engine completely .
pull the head off and look at the gasket you will be able to tell where the leak is crossing over at .
take the head down to a mechine shop and have them check it to make shur its not warpped .
now someone else here with more knowlage on suzuki engines then I do should be able to tell you also about the head bolts . im not sure if suzuki does this or not . but i know chevy on a couple of their engines , have head bolts that screw right into coolent passages . if you dont put on a sealing compund on those bolts , coolent will pump right up into the valve covers and down into the oil pan .
this will also act like a blow head gasket becouse the coolent leack around the valves into the cylinders
sounds to me like you have 1 of4 things happening or a combination of all 4
1) cracked coolent passage 3
2) warped head and thus a baddly blow head gasket
3) the engine has a head bolt that goes into a coolent passage and is not sealed . thus is leaking coolent up onto the cam down into the crank case and through the valve seals into the cylinders
4) intake gasket gasket leaking coolent into the intake .
i wouldnt think that would be the case though as with that much water the engine should have locked up
