Does it get louder or does it level out when you give it some throttle? You may want to go to a place like Harbor Freight and pick up a cheap stethoscope and see if you can isolate the sound. It sure sounds like valve train noise, possibly a bad lifter.
Good idea, it will give you more room to work. Removing the tank and rocker box really isn't that bad of a job. Patients is key to success. If you need to take pictures so you remember how it goes back together.
Can anyone tell me if there is a way to check to see if it is a lifter or pushrods. I have all stock the rods are not adjustable. Before I go ripping the tank off and getting into the rockerbox I'd rather eliminate the lifters first. Thank you all for all the help