Well, they say that the simplest approach is sometimes the best.

Major brainstorm. The Vortec 454 uses a 24x reluctor on the crank snout, just like the Vortec 350 and its 4x reluctor. Same firing order too. There are only two issues...the first issue is the keyway on the 24x reluctor is off slightly from the 4x, and the second issue is the 454 crank is thicker. So the 24x won't fit as it is...

...unless you attach it to the crank timing cog.

So, lets machine a shaft with two thicknesses, one for the 350 crank, and one for the 454 crank, and use that as a fitment tool to ensure concentricity. Then we fit both the timing cog (350) and the reluctor (454) on that. After finding where the 24x wheel should be in relation to where the 4x wheel would have been, we drill 6 holes through both, tap the timing cog and countersink the reluctor wheel, and attach with screws.

Thoughts????