Injection system

The OP is running a Roots blower with a cam that has 110LSA. The overlap should keep the combustion chambers cool.
At 5PSI start tuning with the carb/ ignition you have. Keep the total timing at 28° for a safe start.
I'd bump the timing up to 30 or 32° max in small increments, listening for knock under load.
Learn how to tune the carb (idle, cruise, WOT) before adding W/M injection. Keep it simple.
With your 3.55 rear gears, you will be in and out of boost and I can't imagine you being under boost for extended periods of time.