With that monster under the bonnet and the 4.3 LSD yours will be a rocket!!
Jon, I'd say it would depend on the engine spec and what you plan to do with the car. Triples or flat slides have a much better throttle response, the CV's are vaccuum operated slides so they give good low down torque but lack in throttle response. You'll find a heap of people who are willing to tune webers or mikunis but not many will want to tune the CV bike carbs. If your planning such a high revving engine I'd say stick with the age proven triple setup.
The cars intended use has changed a lot since I did the bike carb swap, it was more road oriented back then. I managed to get 8 carbs for $360, paid $120 for couplers, $ for jetting and welded the manifold myself(first attempt). So it was a dirt cheap upgrade, as I couldn't justify triple 45's at the time. If I had my time over I would've got the manifold professionally done, it worked fine, but a laser cut flange with tapered runners would have made it perform better. They were quite good economy wise and performed better than my triple 40 dellortos, how they would match up against 45's I'm not sure.
There's always FCR's but be prepared to spend $ and do a heap of research into tuning them.