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I am building an OM with a bolt-on neck. Box is closed and bound. I am working on fitting the neck to the body. I may have sanded the neck block too much while radiusing it and the top of the neck (seated in the neck block with screws tightened) is about 1/32 above the top of the body.

Neck position relative to centerline is spot on.
Neck roll is good.
Neck angle relative to bridge is spot on. 1/32 above the bridge measured with a straight edge from frets to bridge.

Any suggestions on how to true up the top of the neck relative to the body?

Are you saying that the fretboard will not lay on the body? The neck will not go in flush to the top? If that is the case. Get a rasp and elongate the 2 holes for the bolts. If the tenon is hitting the mortice you can take the 32nd off of the tenon. Then you can slide the neck back. You might be right on the bridge with a need to floss the heel a bit with sand paper to get your angle back. But you might be OK as well.

If your problem is the cheeks of the heel are not touching the guitar. You might hollow out the bottom of the heel near the tenon with a chisel so that there is not high wood there holding the cheeks off of the guitar.

Thanks

The fretboard will not lay flat on the body. The tenon is bottomed out so I will try to remove 1/32 from the bottom of the tenon and elongate the bolt holes.

Guessing that I will have to readjust the cheeks and neck angle.