71 Duster 360 turbo build

I saw the trigger wheel site, but need the inner diameter to be right about 4.25” to fit onto the stock pulley. I don’t trust myself to makeup the gap without it being out of round. I’m also still on the stock damper which doesn’t allow a wheel to sit flush so I have one on its way(backordered) from blueprint.

I’m after a setup like this:

3526BAA4-4A0C-429F-9B90-BCFE799FAC8F.jpeg