Mine sounds clunky at idle, but as you pick up RPM and speed, everything is smooth.
After some google searching it appear this is somewhat normal (at least somewhat common) as posted above.
Works good, lasts a long time. Good enough for me. I spend enough on my money pit to go chasing problems that may or may not exist.
If it breaks I will fix it.
Oil level is good, clean and proper. Changed more frequently that necessary for sure.
1991 ProStar / 351W with 1:1 Velvet Drive