Is this a stuck lifter or something more serious? 1973

Just got my 73 coupe running.. it drives and has decent compression.. I'm not scared to get into the engine but not really wanting to at this point..it had been sitting for awhile up until about a month ago when I started working on it( and purchased it.) I ran some engine flush through it and changed the oil after my dad said I might have a stuck lifter. Ive attached a video hopefully someone can hear the sound. Any ideas? I'm an aircraft mechanic not a car one, but don't really do much engine maintenance. Anything helps!
(Well it's saying my uploaded file does not have an allowed extension. Maybe I could email it to someone?)

Thanks again
 
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