Timing Gear Replacement

[1912Krit]

Model A Gurus - I need some advice:

Attempted to remove the timing gear on an engine rebuilt 40 years ago but on the shelf and never installed. Assembled the engine, but saw a small chip on one of the teeth on the fiber timing gear.

Tried the special tool and long bar with a pipe over it for maximum leverage and the nut on the timing gear will not budge. The next step would be to use heat.

Now I feel like I am at a point of proceed or retreat - like the Wagner guys marching on Moscow last week.

Is this worth doing? Is the small chip in the one tooth requiring drastic measures applying heat (afraid of damaging something else) worth the effort or leave it alone?

Please see the photo!