For the answer, see these three fine resources:
“The Gospel and Redemptive-Historical Hermeneutics” by Lane G. Tipton in Confident of Better Things, eds. Meuther and Olinger.
“For Our Sakes Also: Christ in the Old Testament in the New Testament” by Richard B. Gaffin, in The Hope Fulfilled.
And of course, many parts of Beale’s new volume, A New Testament Biblical Theology.
These should prove quite a nice tonic for all that nonsense that is out there wanting to advocate the idea that Christ is in the OT only retroactively in the mind of the community of faith.
I appeal to you, brothers, to watch out for those who cause divisions and create obstacles contrary to the doctrine that you have been taught; avoid them. For such persons do not serve our Lord Christ, but their own appetites, and by smooth talk and flattery they deceive the hearts of the naïve. (Romans 16:17-18)