Correct engine color for 59' 352?

[droptopford]

BUTTTT, on another question related to the valve covers, when I got this '59 the previous owner had removed the 332 and installed a 390. I did get the original engine and can reinstall if I feel I want to. But interim I'm going to use the 390 (he only got it partially installed - so work yet to be done) and I have the option of using valve covers with stamped wording "Thunderbird" or ones with "Power by Ford".
Any thoughts on which one would be 'more correct' (I realize the neither is exactly) ? Just asking opinion. thanks,

All I can tell you is that my original '59 valve covers are stamped with the large block letters... F O R D

[White59]

I know I'm late on this, but I would use the Powered by Ford.