Ackerman is over-rated. It's mostly important for tire wear and is part of the 'voodoo' used to make roadcourse cars turn and keep the front planted but isn't going to make hardly any difference for drag race use. Having perfect ackerman is important on a wagon or anything which needs to have low rolling resistance. Cars are a different matter, and there's all kinds of different ackerman theory, including anti-ackerman!
That said, I wouldn't flip spindles without 'fixing' it. A creative person could probably make some tapered washers/spacers to change the steering arm angle with respect to the spindle axis. It's probably also possible to just flip the balljoint over and use some spacers and some selective grinding to regain clearance and have a neutral or slightly positive ackerman result.
Careful rack location (tie rod angle) can also help fine-tune the final result.
In any event, creative fabrication should overcome any of the potential 'issues' associated with a spindle flip.
