Another crazy Magnum SMPI swap idea. Crank position sensor location.

Right.
What got this going with me was how bad the factory magnum crank sensors suck. They suck to get to when they die, they suck because they DO die, and with the flexplate and sensor your transmission choices are limited. Some people want to use GM or even ford AOD trannies behind their heavily boosted magnums and this facilitates that.
Also makes tweaking the timing a reality. That 46re trans is a piece of ****. I've been through several and I hate them with a passion. I'm giving it one last chance, then I'm going with a cope 727. But I like the idea of being able to put any trans in there that I want with that crap out of the way. I also like the fact that the other options are usually quite a bit cheaper than a 3200 dollar piece of ****. lol

Pulleys...they can be spaced with a washer or something, It's not really a problem.
Use the water pump like the one in my avatar. it has a bolt on pulley. There are even provisions in the hub to use a washer on each bolt hole to space it out a bit.

I dont know what the variable is, but on that same engine (which is carbed) I needed a spacer just about as thick as that plate to properly space out the crank pulley.

I am using a pro products damper and a scat crank. I dont know if my issue will be repeatable but to use that wheel it's a good issue to have.

If you wanted to, you could have a steel pulley machined down and welded to the wheel for proper spacing too...just an idea. It would of course have to be properly located, but that would work too. You could also have the end of the balancer hub machined down a tad to make up the difference. Lots of ways to skin a cat.

But it will work the same as the flexplate. that I guarantee. Doesnt matter what the diameter is. All that matters is that the notches are the right size and in the right degree locations relative to the crank. with a pickup that is adjustable it becomes a lot more forgiving though.