L78 SS 396/375hp not original motor (350 in it now, I have a 1969 396 block/crank) 4 Speed Muncie M21 12 bolt factory ordered 4.56 rear (10 bolt in it now, I have the original KM 12 bolt rear) According to GM RPO records only 1 car with 4.56:1 Chevelle was ordered in 1969, and this is it! Pics of Tailfins and Bowties Book showing 1 RPO - Chevellestuff.com website showing 1 RPO 4.56 order black bench interior black top originally butternut yellow *Documented as well as build sheet * all original sheet metal - floors, trunk, rockers, quarters, frame are all very good. Interior is also very good original.