Hi, if these pickups have poles with hexagonal holes in, these would be Model J. The Ultra Jazz have flat metal surface on poles. I this era the DiMarzio Model J was king. Very high output. Sounding more like humbucker. Very punchy bass-low-mid sound, slightly atenuated highs.
Check the appearance here
http://www.dimarzio.com/site/#/pickups/
DiMarzio classifies them as
Model J:
treble - 4
mids - 5
bass - 6
Ultra Jazz:
treble:- 6
mids - 5
bass - 7
Anyway dont worry about the pickups too much, these should not be the deal breaker, they can be easily and relatively cheaply replaced anytime. More important is if you like the bass, its woods, sustain, construction, fretwork, etc.
As for preamp, for RnB and funk I would go for Sadowsky outboard pre/di - you would get this wide, supportive bass layer for RnB songs and still have the option to use the bass fully passive for funk grunt if necessary. Or make it marcussy with treble knob. Moreover this pedal has very useful mute switch, tuner out and good XLR DI out. And you can use it with other basses too.