c6
Well got it clean after 4 hours with a drill, with a wire brush and hand held brushes, I found out also it is a 1975 model supposedly out of a lincoln or van, but this c6 has fins running down the back of it others ive seen dont ,i found a couple more numbers on it, 6Z556321 on the case and D1AP-7A040-AA on the tailshaft.