Surrender my good life for bad
To find you I'm gonna drown an unsung man
A few touches with a chisel, some filing and some sanding took care of smoothing out the rough edges and trimming them flush to the rest of the heel.
Before putting the screws back in, I clamped her neck in place and checked the projection along the centerline of her fret crowns to her new saddle with a straight edge. It was lining up just below the tip of the saddle.
Pleased with how the projection looked, I restrung This Old Guitar. BTW, here's how I use a capo to save and reuse a set of strings during repair work. She'll get a new set of strings when I'm done adjusting the neck set angle and saddle height.
With her neck reattached and her strings in tune, I used a combo fret rocker / string height gauge to check her 12-th fret action and used my digital tuner to check her intonation.
...and that was making her intonation slightly off, and just a bit more on the bass side than on the treble side. All in all, it was an improvement and a good starting point for adjusting the new shim and saddle.
After a few minutes with a sharp chisel, I reassembled the neck, put the strings back on and put her in tune. Despite the change in neck angle, I found her action was even worse than before. I also noticed that her fingerboard was not sitting as close to her body as it was before, and had a hunch her four neck screws were no longer holding the joint tight enough. I took the strings off at her bridge again and checked a critical measurement.
Although it would have been possible to fill in the screw holes to repair the connection, the shim I added left very little depth for the wood screws to engage the wood. A better solution would be to use longer screws.
An even better solution would be to use brass inserts and machine screws.
A set of deep grommets would also allow me to recess the bolts into the body. I gathered the hardware and left them laid out for the next morning.