As long as everything is setup right, it should be OK, but 34 inch scale B strings tend to sound a bit floppy. Also, if the neck isn't stiff enough, you are probably going to find the B string doesn't sound tight enough for the style you are talking about. If you can, try to find a bass which has a carbon re-enforced neck as well as a truss rod. It will make a big difference in the sound of the B string. It could never get the "Motown" bass sound, but that's not what your after, so who cares.
If you do it, make sure you get a taper-wound B string, which should help with the floppiness, and will absolutely help with the intonation (non-taper-wound B strings are a real bitch to get to play in tune).
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