Did Airlines or Aircraft owners who purchased the Old prop liners Like the DC4 Tune the engines to get the same performance or close to the same performance of say a DC 6 or a constellaton or would it be possible to do that and is it smart to do it i know that due to the airframes stresses but would it be possible and safe to get a type rating on an aircraft because i want to give the Cal Classics DC4 the same power of a DC6