It's a really nice card you have. I took it to Photoshop, and it's definitely within the parameters for a 10 grade on centering side to side.
You have to look at the population report. 14,489 '80 Topps Hendersons have been graded, by PSA, and only fifteen have been given a 10.
For me, BGS is my go to for modern. PSA for vintage, an SGC for pre-war. 1980 is right on the line for vintage/modern, but I still consider the '80 set vintage. Topps was still the only game in town. I personally view 1981 as the start of the modern era.
Good luck with the submission. That really is a beauty.
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