Dave,
My Ditzler color charts info has the following codes:
#8321 Pace Car White (exterior)
#8608 64-1/2 White (interior)
#8612 65 & 66 White (interior)
#8678 64 -1/2, 65, & 66 Wimbledon White (exterior)
#8608 should be the correct color, are you saying that the #8608 you had mixed up doesn't look correct? Could it be that some of the photos of restored cars you're looking at have mistakenly used one of the other whites?