66 mustang, 289 distributer replacement.

Bob4197 said:

Anyone know anything about this.

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Hey if its wrong its wrong.

Carb289/302 distributors are mildly different than 5.0 roller cam distributors.
Different cam gears for roller and non roller.

The following is a couple of online quotes I found....
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68-82 small block 289-302/5.0l has a distributor shaft diameter of 0.467", gear is 1.249".

83-present small block 5.0/ all 351w uses a 0.531" shaft, same 1.249 gear.
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The 351W has a smaller 1.245” diameter distributor gear, and the 351C has a larger 1.418” diameter distributor gear. Each engine has a 5/16” oil drive
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351W's use a 5/16" oil pump driveshaft while all the other small block Fords, 260, 289, 302, 5.0, all use 1/4" size driveshaft.