You can quickly throw together a little math to figure out how often he has to have an A for you to call here assuming his range is A's and J's only.

Also don't post the big blind out of position. (As an aside, you shouldn't do it in full ring either. Your blind money per hand estimates that try to justify it assume no one will leave the table before your first hand in the real big blind, and that's your mistake in your calculation.)