my car has a

yea i didnt finish that my car its got a motor that was recently rebult in it and i duno what this is that is wrong with it but it starts up and has some motor clatter witch i hear is common then it stops and it has this other top end noise but its kinda faint and it goes away or at least gets drowned by my exaust noise but the issue i have now is that i drive on the highway and when i get off my car sounds like crap it sounds likethere is a clacking under the hood and i havent had the problem happen durring the day just at night but i dont think that has anything to do with it jsut that i take the high way to see my girlfriend but the noise happens when i get off the high way and lasts till about the time i get home and it contnuies but the next day when i start the car its gone i duno what it is any ideas would be greatly appreciated would it have anything to do with a cooling problem or oil pump its not low oil i checkd it and its good not burning any either yea i would like some opnions

First noise I think is starter clatter. Its either your starter motor keeps spining after its been engaged. Or the timing chain tensioner

Second noise, I hope is just detonation. Try using higher octane gas till you can get your timing checked.
Also try to pull code 34 from your ECU and you might have a shitty knock sensor like me ;)