I have a 440 hp in my Roadrunner. I think it could be a c body engine. The number stamped above the oil pan is 9D then the six numbers of the vin. 9 is 1969 D is belevedere I believe. Did Belvedere onlybuild c body cars in 1969? C body cars received hp engines in 69 and 70. Am I correct on this...