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yes they did update the 13B over the years, but the good news is that most of the updated parts are things like the rotors and stationary gears, which fit any 13B, so it makes just about any 13B worth building.
if you want EFI it would be best to use an 86 and newer engine, they have injector holes already (and injectors and a fuel rail).
ideally you want the 4 port irons. the 6 ports dont respond to porting very well, so they are more power limited.
the 89-91 non turbo rotors are the lightest, and highest compression
the 89+ stationary gears are hardened from the factory, the 89+ tension bolts are nicer too
the FD bearings are better, you can pick a tighter clearance
the condition of the parts is actually the most important thing, the irons need to be flat, rotor housings need to be good preferably new, new seals, etc etc
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