Pulley-mounted crank trigger w/stock Magnum EFI - trigger notches?

That sensor mount that hipotec sells is probably the easy button here. If you’re using a 727/904 you’ll have to notch the bellhousing but that’s easy. And just use a stock magnum flexplate. I believe all of them are neutral balance as the balance was in the converter.
Edited to add:
I had to elongate one hole on the flexplate to match my 904 converter before I used the 46re.