Pontiac had an off-white in the early 1950s that is almost a yellow. Here's a random '51 Pontiac photo I found with a quick google search. I think you might like the color on your car?
Wow really like that one^^^. I'm painting my buddies 53 white this Sunday. Try to get some pics up when I'm done.
I hear ya. That poncho color is more egg-nog than cream! But it does look beautiful and you never see it except on restored Pontiacs, which aren't exactly common. I think I'm talking myself into using it on my '53 Chevy.
My Opinion: paint it white and do the roof in a slightly diffrent tone, like on the first foto you posted! That looks great!