I'm considering buying the 11" drum brakes from Master Power, but it says that minimum wheel size is 14" disc type wheel with 3.5" offset. I have a 1970 SS396 El Camino with factory 14" SS wheels (front disc, rear drum), but can't accurately measure for the offset because they are mounted with tires. Does anyone know what the offset of these wheels are? Or do you know if the 11" drum brake kit will fit? Thanks.