I ran an 053 w/ a JP round manifold. I was getting close to 10 mins to a tank and it was a beast. I have a werks B7pro now and the radical was quicker. The regular 053 was ok, so was the JP3, but the JP1 was actually better than either. But when I combined the 053 and the JP3 manifold it was an animal with great mileage.
It was the best motor I've ever owned just keep a close eye on the connecting rod after 3 gallons, mine let go just before the 4 gallon mark and took the entire motor out. Knowing what I know now I would have replaced the rod at the 3 gallon mark and still be running that motor.
Side Note: The B7 pro is a great motor it has a very smooth power band, but the radical was just insane out of the hole, almost too much.