[mssl72]

I don't want to ad any confusion, just another possibility. My early GM parts book dated May 1, 1966 shows #3889694 for "PASS., CORVETTE (396, 427) (EXC. A.T.) solid type". My other GM parts book dated June 1978 shows "66-69 All (427) (exc. A.T.) #3998281". Maybe NCRS has one of those on the list. I noticed that flywheels are evil. GM parts group .666!