Identify renegade dreadnought

I have tried to identify this metal dreadnought. I got it with lots of chaos stuff but i am pretty sure it's not chaos. I was going to paint it Iron Hands but wondered if i might be committing some kind of fluff heresy by doing so.
"WTF HAVE YOU PAINTED GREG THE EVERLASTING IN BLACK EVERYONE KNOWS HE IS PINK" sort of thing....
Anyone recognize him?

Its a second edition Space Marine Dreadnought with a plastic Space Wolves Icon on carapace

What Chico said. Pop the plastic space wolf icon off and it will make a perfect Iron Hands dread.

Ahh nice one, i just popped it off. Cheers guys!
- awesome how you guys are so fast and accurate on ids. Love it.