It was 'G'. I am as sure as one can reasonably be that the engine was the original. The car was a solid car that had sat for years when I got it. All the accessories were original, and not even the valve covers appeared to have been off it. You could even still read the bore marking letters on the sides of the block. Greasy and nasty in all the right places. The car was just a garden variety 440 auto, nothing special and at the time they weren't bringing big money. So there wasn't much incentive to doctor the numbers.