The vlach > ICU ignition will work, but it has the old Vlach plug caps. You will have to change the plug caps
The ICU-L will work if you change the prop drive to one with 120° magnet orientation.

The Rcexl works well if you position the sensor to fire at 28°BTDC. To that end, use the South pole magnet so there is room to attach the sensor bracket. The Hall sensor should then have the chamfered side towards the magnet.
You cannot use the original Vlach sensor location! Because Vlach AND ICU fire at about top dead center. If you want to use the original sensor position with Rcexl, your prop drive needs to have the magnet repositioned. That is best done with the magnet in an adjustable ring mounted on the prop drive. You need a machinist near you to make one.