One point of note is Torrance's interest in distinguishing typological interpretation of Old Testament passages as fulfilled in the history of Jesus Christ, a practice Torrance cautiously affirms, and allegorical interpretation of passages from the Old and New Testaments depicting ostensibly historical events as finding their real meaning in timeless esoteric truths, a practice Torrance vehemently denounces as rooted in Platonic dualism between the sensible and intelligible, aka the boogie monster.
The practical difference seems to be that allegory can get you anywhere, while typology always points you to Christ; allegory has the potential to break up the Truth of the gospel into truths, or even to break reality into, yes Torrance, a dualism between the sensible and intelligible, while typology holds together all of scripture in the one truth of Jesus Christ. Torrance puts it this way:
This typological way of interpreting the Old Testament seems to be finding renewed popularity. I myself find it helpful and edifying. Torrance seems to as well, but he also sees how easily it slid into allegorical readings that enabled the Gnostics. This necessitated a stronger framework within which to interpret scripture that would not be so prone to fanciful perversions.
Typology of this kind, which must not be confused with allegory, was an important part of early Church exegesis, for it was a reflection of the deep connections between the Christian Gospel and the ancient past, and an important tool in its battle against gnostic and Marcionite attempts to cut it away from its historical sources and its ground in the fulfillment in space and time of God's creative and redemptive acts. Patristic typology had its roots in Palestinian Judaism. It had its significance within the inseparable relation of word and event and the dramatic images that it involved, and it arose through the use of cultic patterns to point ahead to the enactment and fulfilment in decisive events within the history of the covenant people of God. It was the fulfilment of the ancient promises and figures in the birth and life and death of Jesus Christ that brought it into prominence in early Christianity, for with that fulfilment it was possible to interpret the history of Israel as the pre-history of the Incarnation, and to see how the patterns of Israel's life, manifested in the great events of its history and reflected in the cult, partially realised in the ordeal of suffering, and interpreted by the prophets, all converged in the fact of Christ. Such interpretation of the Old Testament which set forth an account of the acts of God in the old and new economies of Israel and the Incarnation as the fulfilment of the one saving purpose became essential from the start of the Church's life, for it not only assimilated the Old Testament revelation with the New Testament revelation but preserved the unity of the doctrine of God.