I HAVE A 455 WITH ZF STAMPED BY THE DIPSTICK HOLE BUT NOTHING BETWEEN CYLS 1 AND 3 WHAT YEAR IS THIS???
Dave I think it could be a '76 not exactly sure. Check the VIN on the face of the block behind the water pump intake. The second digit will be the second digit of the year. #5=75,#6=76 etc. You'll need a brush and some carb cleaner to see it clearly.