Yeah like dattodevil said definately supply the bowl with a boost signal otherwise boost will prevent fuel from leaving the bowl.
Do that first before you drive it again otherwise before long the engine will be back out for the fried rings to be swapped for new ones.

What pump did you run with the malpassi reg and what pressure did you run at idle and did the pressure increase with boost? Is the malpassi reg new or used? Just curious as if the reg is used and pressure didnt increase maybe the spring inside is rusted and seized.

I am also curious about this oil pressure as I have never had a problem with any but I to have never taken notice probly because it is a light and not a guage. But all the talk in the last few months about oil pressure and flow has got me thinking.