I have a Street Demon on my mild 440. I went to the chassis dyno guy on Friday to have the carb tuned after a recent engine build. He refused to do the job until I put a Holley on. I guess he doesn't like to take the time to disassemble the carb to change jets. Or he doesn't understand metering rod carbs. Either way, i guess I am back to dialing it in some old fashioned way.
On the prior engine a different dyno guy was ok with the Street Demon but then he changed metering rods to avoid changing the jet! It was close enough.