I'm thinking there's a lot of variables that no-one would know off hand.
You mentioned that it was installed "straight up" but now many hours are on the motor and what kind of stretch is in the chain?
Is that amount of stretch worth 2 degrees? Probably but who's to say?

If you feel like you can give up some more of the torque from the bottom then maybe try an adjustable cam gear or one of the multi keyed crank gears. Wouldn't take long to install and it would give you further options if you liked the results, then you might try advancing the cam and test the results.

I helped a friend install an adjustable cam gear in a SBC, he was thrilled with the results but I was left un-impressed. The butt dyno didn't feel any differences, but I was thinking it would make a huge difference. It didn't.