That grey would work, but i think i would go with a littlt bit brighter color like silver. I painted the frame on my 57 truck a shiney silver and it contrasts real well with the Snakeskin Green paint. I went with grey interior also, so everything stays in that range.Just my opinion, but really go with what you like.

1957 Dodge truck, Snakeskin Green with a little stroker motor. 1964 Plymouth Savoy wagon ( my new project)