mark 5 coolant leak. need some help troubleshooting

carfreak

Registered
my 78 mark 5 has a coolant leak. under the front of the engine block. all of the hoses are fine. but when i put coolant in it just starts leaking. and is all empty in like 5 days. could it be the freeze plug or head gasket? any help would be great! thanks.
 
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