Out of curisosity, what was wrong with it that your dad fixed before he gave it to you?
From your description and unless I'm mistaken, you've probably got a blown head-gasket (loss of coolant and overheat condition), valve rattle from overheating (rocks in cans sound) as well as possible rod knock (from low oil pressure or volume) allowing your connecting-rod bearing or bearings to get chewed up. That will all have to be confirmed by a competent mechanic, but if it is confirmed you're looking at some pretty significant repairs, up to and including a complete rebuild depending on the actual damage done.
Not trying to scare you as a relative newb, but unless I'm mistaken it sounds like you might want to prepare yourself for some rather substantial repair bills. Find a good, trustworthy mechanic and keep your fingers crossed.
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