Mr2 rod knock?

bought, pistons, valve, hitting, knock, messed, cover”, valves, https://youtu.be/ykfamfeaycs, timing, knocking, deal, knew, piston, good, bearing, spun, slap

I got this mr2 for a really good deal, I knew it was knocking when I bought it. Is it rod knock? Piston slap? Pistons hitting a valve? Spun bearing? The guy I bought it from said “he messed around under the valve cover” so could this just be the timing is off and the pistons are hitting the valves? https://youtu.be/yKFAmfeaycs