Here’s the deal I have a 383 with an EFI intake manifold and throttle body. The car is putting out 430-440 hp N/A at the wheels on a Mustang dyno. I have added a N2O Powershot plate which is for a carbureted motor with 4-5 psi fuel pressure. I tried to use the sizes called out for a TPI system (71 nos/53 fuel) but that was fat, my air/fuel ratio was around 9 to 1 with those jets. So I was wondering if anyone has done this kind of set up and if so what jets are you using?

One more thing this is based on a LT-1 set up I have in a firebird, but if it makes you feel better I do have a N2O set up on my LSI Corvette.