Romans is quite clear, all of it should be studied.
It answers virtually all of the questions most often posed regarding Jews and Israel in light of the New Testament.
Of course, then, we know that when we err in our doctrine in this regard we are evidencing our lack of study of that book.
Oh, how joyful the doctrine presented in Romans.
Yes, Paul describes the future salvation of Israel in clear doctrinal language in Romans 11 - not apocalyptic language - and this should be the basis upon which prophetic passages are understood. 2 Thessalonians is also very similar to Romans 11 as Paul describe the coming of the Antichrist in clear language without symbolism.