Bredboard compatible FAST TTL
If you're looking to build up a computer out of discrete logic, and you're fixing to use breadboards, don't bother with FAST. Although you can easily get many of the 7400 series parts in FAST (search on 74F374, for instance), breadboards, at least solderless breadboards, will simply not support clock rates which make FAST necessary. The circuits get too spread out and the wires (particularly clocks) get too long to work reliably. Additionally, the TTL/LSTTL/ALSTTL/FAST/etc families are pretty much restricted to 4 bit logic functions (including ALUs) and 8 bit storage/bus functions. 16 bit functions never were much available, in part because the packages get so big. A 16-bit register, for instance, would require at least 36 pins, probably on a 0.6 wide DIP, and two 20-pin packages take up less room. There are some exceptions, such as multipliers, but they are few and far between.

Frankly, I'd recommend the 74HC family. If nothing else, the reduced power requirements will make your project far easier. Any sort of FAST system with any complexity will take amps at 5 volts, and most likely 10s of amps.