Jimmy: Yes, all CMC and FF cars seem to sit a little to one side unless the builder noticed the difference as the body was being mated to the pan and compensated for it. This (centering the rear) and adjusting the front wheels versus the opening are best done when the body is being mated, but most people never checked and just put them together.
John: If you want to move the front wheels forward (only) in the wheel wells AND you don't need to move them more than an inch, you could consider having a pair of spacers made for where the beam bolts attach the beam to the pan headset. They would have to be made from harder aluminum billet (or steel) and could simplify the process a bit but they would have to fit the curved spaces where the beam and headset come together. You would then have to slightly reposition the steering column to accommodate the beam moving forward (easy), but that's all I can think of to do.
That would seem to make the least amount of work.