Im a long away from being a expert on old paint, But I really don't think any one knows what the org. tacoma cream looks like from the 28-31 era. all one can do is get as close as they can, If some one had a gal. of any paint made in that era and it was still good [would be imposible] and you sprayed it, you would probley be put in jail by the epa "goone's" plus a heavy fine.
At model "A" shows I've been to I've seen everything from near white to bright yellow, They all look great to me.
In my opin. any one who says they know what the org. authentic [29-31 era] paint look's are living in a dream world, It can't be done.
All you can do is get close. JMO

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