Garggling Marbles

I got the donor CB750 running yesterday after some work. I was told it was a daily rider. I had a hard time starting it, bogs at midrange throttle, and the cam chain sounds horrible. Looks like I'll need to do a full tune-up to see what's going on. This motor is going into my '76 CB750 that still needs a full rebuild. Then I'll sell off the chassis, and basically have a free running motor.