The big old Revell B-1B is kind of like Polar Light's 1/350 USS Enterprise Refit; both can lead to epic builds but the road is long. The B-1 kit came out at a time when the real thing was undergoing changes from the B-1A to B-1B. Thus some details do not represent a production B-1B model.
Off the top of my head, major changes to the real thing included deleteion of the crew escape capsule, changes to the engine inlet design, and simplification of the overwing fairings. The engine inlets were originally designed to accomodate Mach-2 dash speed, but the B-1B sacrificed that for stealthier inlet trunking to suit the low-level penetration misison.
But if you choose to build it without any corrections/modifications, it is still a beast of a kit! Buy lots of spray paint!