Great fabrication and design.
Here's the thing though. The reversion is not caused by the carbs. It's caused by the cam timing events in a V8 with individual intake runners.
Changing to another carb other than the 48ida doesn't fix the problem. It's caused by the individual runner intake manifold.
The fires are not caused by the carbs. What happens is that the reversion pushes back the atomized fuel and that gets collected by the air cleaners.
The fuel saturates the filter elements. They get soaked with fuel.
When you go to restart the car, the ignition flame travels up the intake runner and ignites the saturated filters.
I like what you have done with the fabrication of the air cleaner but you are going to have to put the filters, not over the carbs but at the extreme end of the flexible air supply tubes and pray that the fuel plume doesn't reach that far.
You are also going to need to provide some sort of a drain in the base of the air cleaner and some sort of collection mechanism to collect the fuel in a way where it can't ignite. If you don't then you likely have created an explosive device in that air cleaner?
A Ford 302 is not a Maserati engine and has different characteristics.
As I said though, beautiful fabrication work.
I also have seen two racing Mangusta's running a 48Ida system using jack-shafts. Just not original ones and mounting brackets although still a simple system. I have no details on those though so I can't offer any help on specifics. Sorry.
Carry on!