hopefully not the bottom end, you still cant be sure as someone may have dropped the oil and put new stuff in.
You can generally tell a bigend knock fairly easy on these cars as it will be much more noticeable between 2-3rpm if you lightly feather on and off the throttle when shes hot.
You will hear a distinct dull type knock as you just come off the throttle when theres play in the bearing/s.
Valve train and incorrect shim adjustment is generally a loud rattling noise which is normally in time with the engine / cams and is very noticeable especially when cars warmed up to running temp
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