Wally,
First of all let me say that your truck is beautiful... if mine turns out half as good as yours I'll be thrilled, but that color isn't Seacrest Green seen on any chip book from that era.
HERE'S Seacrest Green from a DuPont book
I plan to paint mine Seacrest Green too and I've seen chip books from DuPont, Ditzler and Martin Semour and they are all much more like a healthy grass green. Yours looks more like Ocean Green as seen in the chips book page linked to earlier.
Not sure how yours was originally painted that color and I'm not saying that it's not a perfect match to the color on your cowl, but I'm sure that if you find a color book you'll see that it's not Seacrest Green as specified for a '51 Chevrolet truck.
But like I sad your truck is great and you are to applauded for your work.
