It would mess up the steering geometry, the Ackerman angle.
Ideally when looking down on the truck if you draw a line from each kingpin back to the center of the rear axle then also on those lines are the centers of your tierod ends.
If steering arms are forward of the kingpin the tie rod ends ought to be wider than the king pins. If you flip it around they would still be wider but now well outside this line from kingpin to center of rear axle.

Even if it worked out you need a different steering box..

Just use the P30 steering arms and save yourself a lot of trouble.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-