Looking at purchasing a 6-a. was a quick build kit. engine o-360 is set up for constant speed but builder put fixed pitch on it. if I want to convert back, would any cowl modifications be needed or would spinner backing plate be in same location? builder says was a 98-99 purchase with the newer cowl. think he said S type cowl. probably been answered before. Know I would need gov. and cable, but would hate to have to mess up a finished cowl.