Did the 340 really make 275hp?

My last 340 car was a 73 Challenger 4 speed car, and I can say that bone stock engine had to have well over 300 hp, it did not have anything dun to it, factory exhaust and intake manifolds and breather with 82.000 miles on it, a 1968 383 roadrunner stock could not out run it, but it was at my 1/4 panel on an 1/8 mile track. I agree that it depended on a fresh clean cast like abodyjoe said, and what carb was used from the factory line.