[bad421]

70 rs/ss suffix code is ctu, heads are 3973414, block is 3970010. I have looked all over this thing and can't find any rust other than a lil bit of surface rust in places, I traded my bass boat for it a and 66 c10 custom cab lwb parts truck for my dads 65 swb stepper, the 66 also came with a munice m21 close ratio 4 speed sitting in the floorboard.