Crank pulley issue

[1999Gst]

So i did just a simple 6 bolt swap to my 2g this weekend. Started up good, ran perfect. Took it around the block few times everything seemed good, untill on the last trip around the block started hearing a grinding noise. Got home and pulled crank pulley to see it had been rubbing agaist a timing cover and a bolt for the timing cover. That was the grinding noise but it also started to eat away at my oil pump sprocket?? Then on further inspection of crank pull it actually came apart. Now did the crank pulley start rubbing agasit the oil pump sprocket because it was coming apart or because there is a spacer or something i missed when i put it all together? what is all needed when installing crank pulley? thanks any info helps and also looking for a crank pulley lol