Hey guys, I'm new to Club Hot Rod. I've got a 68' Monterey with a 390 FE. From what I know it has the original cam and crank and nothing special done to it so far.

I recently replaced my timing chain and sprockets. Now at higher RPM's I get a horrible rattle, clanking noise(unfortunatly I don't have a tach). The noise doesn't seem to be consisnt or in rythem with the RPM's though. I can't seem to hear it at all at idle or if I just feather the gas. It almost seems like it may be off balanced maybe? It seems to run good, idles a little rough. I haven't timed it yet due to my piece of crap timing light.
The old cam sprocket looked like it maybe was aluminum, coated in a very hard platic?! anyway it had a tooth broken off of it. The new one I believe is steel, def. much heavier than the old one. It seemed to line up good with the new crank sprocket and the chain seemed straight. I pre-lubed the new chain. I don't know if maybe the weight difference between the old and new cam sprocket would matter or maybe just timing it would take care of the rattling?
Any suggestions or input would be greatly appreciated. Thanks