Had the exact set-up and the inverted engine w/high fuel tank is a nightmare (at least for me).
There will be differing opinions about this but even a regulator was less than good as far as I was concerned, it was a constant pain(for me), when it was right there was power to burn and a blast, the 15x4 zinger is great for this combo.
I have become so soured with the problems with getting consistant runs I pulled the Mag out and tried a Super Tigre G-75 which has been outstanding in every respect. No more flooding, regulators and deadsticks, lots of unlimited verticle.
So no-one misunderstands, I have 4 Mag 4 strokers and they are great......they just don't like UCD's inverted mount and tank???????????